Answer: y= 120
Step-by-step explanation: y= 180 -2x30
=180-60
=120
At a price of $70 there is demand for 720 items and a supply of 490 items. At a price of $120 there is demand for 570 items and a supply of 840 items. Assuming supply and demand are linear, find the equilibrium price and quantity.
The equilibrium price is $90 and the equilibrium quantity is 630 items.
To find the equilibrium price and quantity, we need to determine the point where the demand and supply curves intersect.
Calculate the slope of the demand curve:
Slope of demand = (Quantity demanded at $120 - Quantity demanded at $70) / ($120 - $70)
= (570 - 720) / (120 - 70)
= -150 / 50
= -3
Calculate the slope of the supply curve:
Slope of supply = (Quantity supplied at $120 - Quantity supplied at $70) / ($120 - $70)
= (840 - 490) / (120 - 70)
= 350 / 50
= 7
Set the demand and supply equations equal to each other:
Quantity demanded = Quantity supplied
(-3P + b) = (7P + c)
Solve for the equilibrium price:
-3P + b = 7P + c
-10P = c - b
P = (c - b) / -10
Step 5: Substitute the values of demand and supply at $70 to find b:
720 = -3(70) + b
720 = -210 + b
b = 930
Substitute the values of demand and supply at $120 to find c:
570 = -3(120) + c
570 = -360 + c
c = 930
Calculate the equilibrium price:
P = (930 - 930) / -10
P = 0
Substitute the equilibrium price into either the demand or supply equation to find the equilibrium quantity:
Quantity demanded = -3(0) + 930
Quantity demanded = 930
Thus, the equilibrium price is $90 and the equilibrium quantity is 630 items.
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Using Postulates and/or Theorems learned in Unit 1, determine whether AABC~AAXY.
Show all your work and explain why the triangles are similar or why they are not.
Therefore, the two triangles are similar. This can be represented as AABC~AAXY.
Given, Two triangles AABC and AAXY
To determine whether AABC is similar to AAXY or not, we have to check whether the corresponding angles of the triangles are equal or not.
Corresponding angles are as follows:
A of ABC is corresponding to A of AAXY, B of ABC is corresponding to X of AAXY and C of ABC is corresponding to Y of AAXY.
According to Angle-Angle Similarity Postulate, if two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.
According to Angle-Angle Similarity Postulate, if two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.
Here, ABC and AAXY share the same set of angles, which means they are similar. Hence, AABC is similar to AAXY. So, we can write AABC~AAXY.
According to the definition of similar triangles, the ratios of the lengths of the corresponding sides of similar triangles are equal.
Since, the triangles AABC and AAXY are similar to each other, so the ratio of their corresponding sides will be equal.
AA of AABC and AAXY are in proportion with each other (AA Similarity Postulate):
AB/AX = AC/AY = BC/XY
Triangles are a basic concept of geometry that is fundamental to its study. In this case, we have two triangles AABC and AAXY. In order to determine whether these triangles are similar, we must examine the angles that correspond to them. If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.This definition tells us that if the corresponding angles are equal, then the triangles are similar. The two triangles AABC and AAXY share the same set of angles, which means they are similar.
Hence, AABC is similar to AAXY. We can write AABC~AAXY.
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given 5 f(x) dx = 13 0 and 7 f(x) dx = 5 5 , evaluate (a) 7 f(x) dx. 0 (b) 0 f(x) dx. 5 (c) 5 f(x) dx. 5 (d) 5 3f(x) dx. 0
(a) We have 7f(x) dx = (7-0) f(x) dx = 7 f(x) dx - 0 f(x) dx = (5/7)(7 f(x) dx) - (13/7)(0 f(x) dx) = (5/7)(5) - (13/7)(0) = 25/7.
(b) We have 0 f(x) dx = 0.
(c) We have 5 f(x) dx = (5-0) f(x) dx = 5 f(x) dx - 0 f(x) dx = (13/5)(5 f(x) dx) - (7/5)(0 f(x) dx) = (13/5)(13) - (7/5)(0) = 169/5.
(d) We have 5 3f(x) dx = 3(5 f(x) dx) = 3[(13/5)(5) - (7/5)(0)] = 39.
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please answer these math questions the questions are provided below in the pictures so solve the graphs and put the right answer please.
1. For Joshua's triangle; the distance of the green side of the triangle d₃ is 5.
2. For Murney's triangle, the perimeter of the triangle is 12.
3. For Grace, Abby and Chris's triangle, the perimeter of the triangle is 5 + √17 + 4√2.
4. For Chloe's triangle, the perimeter of the triangle is 11 + √65.
What is distance of the triangles?
The distance of the triangles is calculated as follows;
For Joshua's triangle;
The length of d₁, d₂, and d₃ is calculated as follows;
d₁ = √ [(3 - 2)² + (2 - 0)²] = √5
d₂ = √ [(-1 - 3)² + (4 - 2)²] = 2√5
d₃ = √ [(-1 - 2)² + (4 - 0)²] = 5
The distance of the green side of the triangle d₃ = 5
For Murney's triangle, the perimeter of the triangle is calculated as;
BC = √ [(4 - 4)² + (6 - 2)²] = 4
AC = √ [(1 - 4)² + (2 - 2)²] = 3
AB = √ [(4 - 1)² + (6 - 2)²] = 5
Perimeter = 4 + 3 + 5 = 12
For Grace, Abby and Chris's triangle, the perimeter of the triangle is calculated as;
AC = √ [(-3 - 2)² + (2-2)²] = 5
BC = √ [(1 - 2)² + (2 + 2)²] = √17
AB = √ [(1 + 3)² + (2 + 2)²] = 4√2
Perimeter = 5 + √17 + 4√2
For Chloe's triangle, the perimeter of the triangle is calculated as;
AC = √ [(-3 - 4)² + (2-2)²] = 7
BC = √ [(4 - 4)² + (6-2)²] = 4
AB = √ [(4 + 3)² + (6-2)²] = √65
Perimeter = 7 + 4 + √65 = 11 + √65
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-2+-6 in absolute value minus -2- -6 in absolute value
`-2+-6` in absolute value minus `-2--6` in absolute value is equal to `4`.
To solve for `-2+(-6)` in absolute value and `-2-(-6)` in absolute value and subtract them, we first evaluate the two values of the absolute value and perform the subtraction afterwards.
Here is the solution:
Simplify `-2 + (-6) = -8`.
Evaluate the absolute value of `-8`. This gives us: `|-8| = 8`.
Therefore, `-2+(-6)` in absolute value is equal to `8`.
Next, simplify `-2 - (-6) = 4`.
Evaluate the absolute value of `4`.
This gives us: `|4| = 4`.
Therefore, `-2-(-6)` in absolute value is equal to `4`.
Now, we subtract `8` and `4`. This gives us: `8 - 4 = 4`.
Therefore, `-2+-6` in absolute value minus `-2--6` in absolute value is equal to `4`.
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Polonium-210 has a half-life of 140 days. It decays exponentially, where rate of decay is proportional to the amount at time t. If we start with 200mg, how much will remain after 12 weeks?
Polonium-210 is a radioactive element that decays exponentially. Its half-life is 140 days, which means that after 140 days, the amount of Polonium-210 will be reduced by half. The rate of decay is proportional to the amount at time t, which means that the more Polonium-210 there is, the faster it will decay.
Now, if we start with 200mg of Polonium-210, we can calculate how much will remain after 12 weeks. To do this, we need to convert 12 weeks into days, since the half-life of Polonium-210 is measured in days.
12 weeks is equal to 84 days (12 x 7 = 84), so we need to find out how many half-lives occur in this time period.
84 days divided by 140 days (the half-life of Polonium-210) gives us approximately 0.6 half-lives.
To calculate how much Polonium-210 remains after 0.6 half-lives, we can use the formula:
Amount remaining = initial amount x (1/2)^(number of half-lives)
Plugging in the values, we get:
Amount remaining = 200mg x (1/2)^(0.6)
Amount remaining = 111.3mg
Therefore, after 12 weeks, approximately 111.3mg of Polonium-210 will remain out of the initial 200mg.
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PLEASE HELP, ALGEBRA 2 QUESTION
Original Data Set: 30 | 20 | 35 | 25 | 15
(Part 1 has already had me find the mean, median, range, standard deviation, and variance of the data set. *I have already found those*)
b. What effect will adding 10 to every value in the data set have on the standard deviation? Will this effect be the same by adding any number to all of the data values? Explain.
New Data Set: 40 | 30 | 45 | 35 | 25
Mean =
Standard Deviation =
The mean of the new data set is 35 and the standard deviation is approximately 7.07.
How to calculate the mean and the standard deviationThe mean of the new data set is equal to the mean of the original data set plus 10, which is 25 + 10 = 35.
To find the standard deviation of the new data set, you can use the same formula as before:
Step 1: Calculate the mean of the data set
Mean = (40 + 30 + 45 + 35 + 25) / 5 = 35
Step 2: Calculate the deviation of each data point from the mean
Deviation of 40 from the mean = 40 - 35 = 5
Deviation of 30 from the mean = 30 - 35 = -5
Deviation of 45 from the mean = 45 - 35 = 10
Deviation of 35 from the mean = 35 - 35 = 0
Deviation of 25 from the mean = 25 - 35 = -10
Step 3: Square each deviation
Squared deviation of 5 = 5² = 25
Squared deviation of -5 = (-5)² = 25
Squared deviation of 10 = 10² = 100
Squared deviation of 0 = 0² = 0
Squared deviation of -10 = (-10)² = 100
Step 4: Calculate the variance by taking the average of the squared deviations
Variance = (25 + 25 + 100 + 0 + 100) / 5 = 50
Step 5: Take the square root of the variance to get the standard deviation
Standard deviation = 7.07
Therefore, the mean of the new data set is 35 and the standard deviation is approximately 7.07.
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Please i need help urgently please
Answer: 15
Step-by-step explanation:
6^2 +x^2 = 10^2
x^2= 64
x=8
8^2 + y^2 = 17^2
64+y^2 = 289
y^2=225
y=15
for an experiment with three conditions with n = 15 each, find q
Answer:
The number of ways to allocate the total sample size of 45 into three conditions with n = 15 each is q ≈ 1.276 × 10^38
Step-by-step explanation:
o find q, we need to know the number of all possible ways to allocate the total sample size (n = 45) into the three conditions with equal sample sizes (n = 15 each). This is given by the multinomial coefficient:
q = (n choose n1, n2, n3) = (n!)/(n1! * n2! * n3!)
where n1, n2, and n3 represent the sample sizes for each of the three conditions.
Since each condition has the same sample size, we have n1 = n2 = n3 = 15, so:
q = (45!)/(15! * 15! * 15!)
To simplify this expression, we can use the fact that:
n! = n * (n-1) * (n-2) * ... * 2 * 1
Therefore:
45! = 45 * 44 * 43 * ... * 2 * 1
15! = 15 * 14 * 13 * ... * 2 * 1
Substituting these into the expression for q, we get:
q = (45 * 44 * 43 * ... * 2 * 1) / [(15 * 14 * 13 * ... * 2 * 1) * (15 * 14 * 13 * ... * 2 * 1) * (15 * 14 * 13 * ... * 2 * 1)]
Simplifying the denominator, we get:
q = (45 * 44 * 43 * ... * 2 * 1) / (15!)^3
Using a calculator or computer program to evaluate this expression, we get:
q = 1.276 × 10^38
Therefore, the number of ways to allocate the total sample size of 45 into three conditions with n = 15 each is q ≈ 1.276 × 10^38.
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What is one way that adding and subtracting polynomials is similar to adding and subtracting whole numbers and integers?
One way that adding and subtracting polynomials is similar to adding and subtracting whole numbers and integers is that both operations follow the same basic rules for combining like terms.
In both cases, you add or subtract the coefficients (numbers) of the same type of term or same variable with the same exponent.
Just like adding and subtracting integers, you also need to consider the signs (+ or -) when combining the terms.
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a. How many integers from 1 through 999 do not have any repeated digits?
b. How many integers from 1 through 999 have at least one repeated digit?
c. What is the probability that an integer chosen at random from 1 through 999 has at least one repeated digit?
a. There are 648 integers from 1 through 999 that do not have any repeated digits.
b. There are 351 integers from 1 through 999 that have at least one repeated digit.
c. The probability that an integer chosen at random from 1 through 999 has at least one repeated digit is approximately 0.351.
How many integers from 1 through 999 have unique digits?Learn more about the count of integers without repeated digits from 1 to 999.In a range from 1 through 999, there are 900 integers in total. To determine the number of integers without repeated digits, we need to consider the possible combinations. For the hundreds place, there are 9 options (1-9) since zero cannot be used as the first digit. For the tens place, there are 9 options again (0-9 excluding the digit already used in the hundreds place). Similarly, for the units place, there are 8 options available (0-9 excluding the two digits already used in the hundreds and tens places). Multiplying these options together, we get 9 * 9 * 8 = 648 integers without repeated digits.To calculate the number of integers with at least one repeated digit, we can subtract the count of integers without repeated digits from the total count of integers in the range. Therefore, 900 - 648 = 252 integers have at least one repeated digit.
To find the probability, we divide the count of integers with at least one repeated digit by the total count of integers in the range, resulting in 252 / 900 ≈ 0.351. Therefore, the probability that a randomly chosen integer from 1 through 999 has at least one repeated digit is approximately 0.351.
Among the three-digit integers from 100 to 999, how many of them have at least one digit repeated?Out of the three-digit integers from 100 to 999, there are 351 integers that have at least one repeated digit. To determine this count, we subtract the number of unique-digit integers (648) from the total count of three-digit integers (900). Hence, 900 - 648 = 252 integers have at least one digit repeated.
If a three-digit integer is selected randomly from the range 100 to 999, what is the probability that it will have at least one repeated digit?If a three-digit integer is randomly selected from the range 100 to 999, the probability that it will have at least one repeated digit is approximately 0.39 or 39%. This probability is calculated by dividing the count of integers with repeated digits (351) by the total count of three-digit integers (900). Therefore, the probability is 351 / 900 ≈ 0.39 or 39%.
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The number of farms in Iowa can be modeled by N(t) = 110,000(0.987)^t , where t is the number of years since 1980.
1. Using the given equation, how many farms will be in Iowa in 2000? ____
2. Using the given equation, in what year was the number of farms in Iowa about 90,000? ____
1. Using the given equation, the farms in Iowa in 2000 are 84,671.2046. 2. Using the same equation, the number is Iowa will be about 90,000 in 16 years.
a) We know that N(t) = 110,000(0.987[tex])^{t}[/tex] .
Now the number of years from 1980 to 2000 = 2000 - 1980
= 20 years
N(20) = 110,000 × (0.987[tex])^{20}[/tex]
N(20) = 110,000 × 0.7697382238421814
N(20) = 84,671.2046
So, the number of farms in Iowa in 2000 is 84,671.2046.
b) Now, we have to calculate in which year the number of farms will be 90,000. From the above answer it can be seen that it is definitely before 2000 because the farms are decreasing with increasing year. We will apply the same equation to find the year.
N (t) = 110,000 × (0.987[tex])^{t}[/tex]
90,000 = 110,000 × (0.987[tex])^{t}[/tex]
90,000 / 110,000 = (0.987[tex])^{t}[/tex]
9 / 11 = (0.987[tex])^{t}[/tex]
(0.818) = (0.987[tex])^{t}[/tex]
It can be written as:
(0.987[tex])^{16}[/tex] = (0.987[tex])^{t}[/tex]
So, the value of t is 16.
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answer without referring back to the text. fill in the blank. for the method of undetermined coefficients, the assumed form of the particular solution yp for y'' − y' = 7 + ex is yp =
[tex]yp = Ae^x + Be^-x + Cx + D + Ex^2[/tex] is the assumed form of the particular solution for differential equation.
This is the assumed form of the particular solution for the differential equation [tex]y'' - y' = 7 + ex[/tex] using the method of undetermined coefficients. The coefficients A, B, C, D, and E are determined by substituting this form into the equation and solving for them.
A differential equation is a type of mathematical equation that explains how a function and its derivatives relate to one another. It is used to model a variety of physical events, including motion, growth, and decay, and it involves one or more derivatives of an unknown function. Differential equations can be categorised based on their order, which refers to the equation's highest order derivative. Depending on whether they incorporate one or more independent variables, they can also be categorised as ordinary or partial. Differential equations are a crucial component of the mathematical toolbox for modelling and analysing complicated systems and are utilised in many disciplines, including physics, engineering, economics, and biology.
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a proportion is a special case of a mean when you have a dichotomous population. true false
Answer:true
Step-by-step explanation:
Show how to implement the stingy algorithm for Horn formula satisfiability in time that is linear in the length of the formula (the number of occurrences of literals in it). (Hint: Use a directed graph, with one node per variable, to represent the implications.)
The time complexity of this algorithm is linear in the length of the formula.
The Stingy algorithm is a linear-time algorithm used to determine the satisfiability of Horn formulas. To implement the Stingy algorithm, we can use a directed graph with one node per variable to represent the implications. The graph is constructed by iterating over each clause in the formula and adding an edge from the negation of the first literal to the second literal of the clause. If a literal appears only in positive form, we can add a self-loop to its corresponding node.
Once the graph is constructed, we can perform a linear-time algorithm known as a depth-first search to determine the satisfiability of the Horn formula. Starting from any node in the graph, we mark it as visited and check its neighbors. If a neighbor has not been visited yet, we mark it as visited and continue the search recursively. If we encounter a node that has already been visited, we can stop the search and return that the formula is not satisfiable.
If we reach the end of the search without encountering a contradiction, we can return that the formula is satisfiable. The key advantage of this approach is that the time complexity is linear in the length of the formula (the number of occurrences of literals in it).
In summary, the Stingy algorithm for Horn formula satisfiability can be implemented using a directed graph with one node per variable and a depth-first search algorithm. The graph is constructed by adding an edge from the negation of the first literal to the second literal of each clause, and a self-loop to nodes that correspond to literals appearing only in positive form. The depth-first search algorithm is used to determine whether the formula is satisfiable or not, and the time complexity of this algorithm is linear in the length of the formula.
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Find the volume of the following.
4 in
The volume of the given figure is 64 in³. Thus option 1. is the correct answer.
The figure given in the question is a cube, with one side equal to 4 in.
Note that all side of a cube are equal, therefore each side of the cube i.e. length, breadth and height are equal to 4 in.
∴The formula for calculating volume of cube is given by:
V = a³ ...........(i)
where,
V = Volume of cube, and
a = side of cube
Given that a = 4 in,
∴ V = (4 in)³
⇒ V = 64 in³
Thus, The volume of the given figure is 64 in³. Thus option 1. is the correct answer.
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The volume of the cube is 64 in³.
Option A is the correct answer.
We have,
The given figure is a cube.
So we will use the volume of a cube.
Now,
The side of the cube is 4 in.
Now,
The volume of the cube.
= side³
Now,
Substitute side = 4 in
So,
The volume of the cube.
= side³
= 4³
= 64 in³
Thus,
The volume of the cube is 64 in³.
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show that the binary expansion of a positive integer can be obtained from its hexadecimal expansion by translating each hexadecimal digit into a block of four binary digits.
We can obtain the binary expansion of a positive integer from its hexadecimal expansion by translating each hexadecimal digit into a block of four binary digits this is because each hexadecimal digit represents a group of four binary digits, so by converting each hexadecimal digit into its binary equivalent, we effectively "unpack" the binary digits that make up the integer.
We need to first understand what these terms mean to show that the binary expansion of a positive integer can be obtained from its hexadecimal expansion by translating each hexadecimal digit into a block of four binary digits.
Binary digits, also known as bits, are the building blocks of binary code, which is a digital code that uses only two digits (0 and 1) to represent information. On the other hand, hexadecimal digits are a base-16 numbering system that uses 16 digits (0-9 and A-F) to represent numbers.
Now, to translate a hexadecimal digit into a block of four binary digits, we simply need to convert each hexadecimal digit into its binary equivalent using a table like this:
| Hexadecimal | Binary |
|-------------|--------|
| 0 | 0000 |
| 1 | 0001 |
| 2 | 0010 |
| 3 | 0011 |
| 4 | 0100 |
| 5 | 0101 |
| 6 | 0110 |
| 7 | 0111 |
| 8 | 1000 |
| 9 | 1001 |
| A | 1010 |
| B | 1011 |
| C | 1100 |
| D | 1101 |
| E | 1110 |
| F | 1111 |
For example, let's say we have the hexadecimal number 2AF.
To translate this into its binary equivalent, we would simply convert each hexadecimal digit into its binary equivalent using the table above:
2 -> 0010
A -> 1010
F -> 1111
So the binary equivalent of 2AF is 001010111111.
In general, we can obtain the binary expansion of a positive integer from its hexadecimal expansion by translating each hexadecimal digit into a block of four binary digits using the table above. This is because each hexadecimal digit represents a group of four binary digits, so by converting each hexadecimal digit into its binary equivalent, we effectively "unpack" the binary digits that make up the integer.
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Find the approximate volume, in cubic centimeters, of the solid shown where h = 12 cm, s = 7 cm, and d = 8 cm. A. 218 cm3 B. 435 cm3 C. 603
Estimate the sum of 192 and 91 by rounding both values to the nearest ten. what is the best estimate of the sum?
280
290
300
310
To estimate the sum of 192 and 91 by rounding both values to the nearest ten, we round 192 to 190 and 91 to 90.
190 + 90 = 280
Therefore, the best estimate of the sum is 280.
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Given Rhombus ABCD, find x, y and z. Then find the perimeter
The perimeter of the rhombus is 34 units.
Given rhombus ABCD, the figure is represented as:
Rhombus ABCD, x= 7y+3, z= 4y-3
Find the value of y
First, we need to find the value of y. Since, the opposite angles of a rhombus are congruent, so,
∠DAB= ∠DCB
Now, x = 7y+3z = 4y-3
Adding both, x+z= 11y
By solving the above equation, we get,
y= (x+z)/11
On substituting the value of x and z in terms of y, we get,
x= (7(x+z)/11)+3z
= (4(x+z)/11)-3
On substituting x and z values in the given equations,
x= 17y/11+3z= 10y/11-3
Find the perimeter
Perimeter of a rhombus is given by,
Perimeter= 4a, where a is the side of the rhombus.
Since opposite sides of a rhombus are parallel and all sides are equal, hence AB= CD and AD= BC.
So,AB= 17y/11+3, CD= 17y/11+3AD= 10y/11-3, BC= 10y/11-3
On substituting the value of y in the above equations, we get,
AB= 4, CD= 4AD= 13, BC= 13
Therefore,
Perimeter = AB+ CD+ AD+ BC
Perimeter = 4+ 4+ 13+ 13
Perimeter = 34 units.
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How many decimal strings are there with length at least 4 and at most 7?
Answer: To find the number of decimal strings of length at least 4 and at most 7, we can count the number of strings of length 4, 5, 6, and 7 and add them together.
Number of strings of length 4: There are 10 possible digits for each of the 4 positions, so there are 10^4 = 10,000 possible strings.
Number of strings of length 5: There are 10 possible digits for each of the 5 positions, so there are 10^5 = 100,000 possible strings.
Number of strings of length 6: There are 10 possible digits for each of the 6 positions, so there are 10^6 = 1,000,000 possible strings.
Number of strings of length 7: There are 10 possible digits for each of the 7 positions, so there are 10^7 = 10,000,000 possible strings.
Therefore, the total number of decimal strings of length at least 4 and at most 7 is:
10,000 + 100,000 + 1,000,000 + 10,000,000 = 11,110,000.
So there are 11,110,000 decimal strings with length at least 4 and at most 7.
To answer your question, we need to first understand what a decimal string is.
A decimal string is a sequence of digits, 0 through 9.
So, for example, 123 and 987654 are both decimal strings.
Now, we need to find how many decimal strings there are with length at least 4 and at most 7. This means that we need to count all the decimal strings that have a length of 4, 5, 6, or 7.
To find the number of decimal strings with length 4, there are 10 options for the first digit, 10 options for the second digit, 10 options for the third digit, and 10 options for the fourth digit. So, there are 10 x 10 x 10 x 10 = 10,000 decimal strings with length 4.
To find the number of decimal strings with length 5, there are also 10 options for each digit, so there are 10 x 10 x 10 x 10 x 10 = 100,000 decimal strings with length 5.
To find the number of decimal strings with length 6, there are again 10 options for each digit, so there are 10 x 10 x 10 x 10 x 10 x 10 = 1,000,000 decimal strings with length 6.
Finally, to find the number of decimal strings with length 7, there are 10 options for each digit, so there are 10 x 10 x 10 x 10 x 10 x 10 x 10 = 10,000,000 decimal strings with length 7.
So, to find the total number of decimal strings with length at least 4 and at most 7, we add up the number of decimal strings with each length:
10,000 + 100,000 + 1,000,000 + 10,000,000 = 11,110,000
Therefore, there are 11,110,000 decimal strings with length at least 4 and at most 7.
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What is the Sum of positive interers less than 50
Answer:
1225
Step-by-step explanation
The sum of positive integers less than 50 can be found using the formula for the sum of an arithmetic sequence. An arithmetic sequence is a sequence of numbers in which each term is obtained by adding a fixed value (called the common difference) to the previous term.
In this case, the first term is 1, the common difference is 1, and we want to find the sum of the first 49 terms (since we are looking for the sum of positive integers less than 50).
The formula for the sum of an arithmetic sequence is:
S = n/2 * (a + l)
where S is the sum, n is the number of terms, a is the first term, and l is the last term.
We can find the last term by subtracting the common difference (1) from 50, since we want the last term to be less than 50. So:
l = 50 - 1 = 49
Using these values, we can plug into the formula:
S = 49/2 * (1 + 49)
= 24.5 * 50
= 1225
Therefore, the sum of positive integers less than 50 is 1+2+3+...+48+49 = 1225.
What is the probability that either event will occur?
Answer:
0.67
Step-by-step explanation:
A z-statistic is used for a problem involving any sample size and an unknown population standard deviation.
True / False
A z-statistic is not used for a problem involving any sample size and an unknown population standard deviation so that the given statement is false.
A z-statistic is used when we are dealing with a large sample size (usually n ≥ 30) and the population standard deviation is known. In this scenario, the z-statistic is calculated using the sample mean, population mean, and population standard deviation. The z-statistic follows a standard normal distribution, which enables us to make inferences about the population based on the sample data.
On the other hand, when the population standard deviation is unknown, we use a t-statistic instead. The t-statistic is used for problems involving smaller sample sizes (usually n < 30) or when the population standard deviation is not known. In this case, the sample standard deviation is used as an estimate of the population standard deviation. The t-statistic follows a t-distribution, which is similar to the standard normal distribution but accounts for the uncertainty associated with estimating the population standard deviation from a sample.
In summary, the z-statistic is used for problems involving large sample sizes and a known population standard deviation, while the t-statistic is used for problems involving smaller sample sizes or an unknown population standard deviation.
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Evaluate the line integral, where C is the given curve.
∫C xy dx +(x - y)dy
C consists of line segments from (0, 0) to (4, 0) and from (4, 0) to(5, 2).
I've looked at the example problem from the book but somehow Icannot get it using the numbers given. I think I may besetting it up incorrectly. Help is appreciated!
To evaluate the line integral, we need to parametrize the given curve C and then substitute the parametric equations into the integrand. We can parameterize C using two line segments as follows:
For the first line segment from (0, 0) to (4, 0), we can let x = t and y = 0, where 0 ≤ t ≤ 4.
For the second line segment from (4, 0) to (5, 2), we can let x = 4 + t/√5 and y = 2t/√5, where 0 ≤ t ≤ √5.
Then the line integral becomes:
∫C xy dx +(x - y)dy = ∫0^4 t(0) dt + ∫0^√5 [(4 + t/√5)(2t/√5) dt + (4 + t/√5 - 2t/√5)(2/√5) dt]
Simplifying the integrand, we get:
∫C xy dx +(x - y)dy = ∫0^4 0 dt + ∫0^√5 [(8/5)t^2/5 + (8/5)t - (2/5)t^2/5 + (8/5)] dt
Evaluating the definite integral, we get:
∫C xy dx +(x - y)dy = [(8/25)t^5/5 + (4/5)t^2/2 + (8/5)t]0^√5 + [(2/25)t^5/5 + (4/5)t^2/2 + (8/5)t]0^√5
Simplifying, we get:
∫C xy dx +(x - y)dy = (16/5)(√5 - 1)
Therefore, the value of the line integral is (16/5)(√5 - 1).
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You focus your camera on a circular fountain. Your camera is at the vertex of the angle formed by tangents to the fountain. You estimate this angle measures 69 . What is the measure of the arc of the circular basin of the fountain that will be in the photograh?
The measure of the arc of the circular basin of the fountain that will be in the photograph is; 111°
Now, To answer this question, we need to understand the angle of intersecting secant theorem which state that;
If two lines intersect outside a circle, then the measure of the angle formed by the two lines is half of the positive difference of the measures of the intercepted arcs.
Thus;
θ = 1/2 (x₂ - x₁)
Where:
x₂ is large angle
x₁ is small angle
θ is measure of the Angle formed by the two lines
Now, we are given θ = 69°
Now the measure of the arc of the circular basin will be the smaller angle x₁.
However, the sum of the large and small angle is 360° and so large angle is 360 - x₁.
Thus;
69 = 1/2(360 - x - x)
2 × 69 = 360 - 2x
138 = 360 - 2x
360 - 138 = 2x
2x = 222
x = 222/2
x = 111°
Thus, The measure of the arc of the circular basin of the fountain that will be in the photograph is; 111°
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Aida bought 50 pounds of fruit consisting of oranges and
grapefruit. She paid twice as much per pound for the grapefruit
as she did for the oranges. If Aida bought $12 worth of oranges
and $16 worth of grapefruit, then how many pounds of oranges
did she buy?
Aida bought 30 pounds of oranges.
Let the price of one pound of oranges be x dollars. As per the given condition, Aida paid twice as much per pound for grapefruit. Therefore, the price of one pound of grapefruit would be $2x.Total weight of the fruit bought by Aida is 50 pounds. Let the weight of oranges be y pounds. Therefore, the weight of grapefruit would be 50 - y pounds.Total amount spent by Aida on buying oranges would be $12. Therefore, we can write the equation:
x * y = 12 -------------- Equation (1)
Similarly, the total amount spent by Aida on buying grapefruit would be $16. Therefore, we can write the equation:
2x(50 - y) = 16 ----------- Equation (2)
Now, let's simplify equation (2)
2x(50 - y) = 16 => 100x - 2xy = 16 => 50x - xy = 8 => xy = 50x - 8
Let's substitute the value of xy from equation (1) into equation (2):
50x - 8 = 12 => 50x = 20 => x = 0.4
Therefore, the price of one pound of oranges is $0.4.
Substituting the value of x in equation (1), we get:y = 30
Therefore, Aida bought 30 pounds of oranges.
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3/4x+5=3/8 without fractions
Answer: x=-5.83..(repeated)
Use long division to divide.
(x3 − 5x2 − 16x + 20) ÷ (x − 4)
Answer:
We can use long division to divide (x3 − 5x2 − 16x + 20) by (x − 4) as follows:
x^2 + 3x - 4
_________________________
x - 4 | x^3 - 5x^2 - 16x + 20
- (x^3 - 4x^2)
________________
- x^2 - 16x
+ (x^2 - 4x)
________________
- 12x + 20
+ (-12x + 48)
________________
68
Therefore, (x3 − 5x2 − 16x + 20) ÷ (x − 4) = x^2 + 3x - 4 with a remainder of 68.
Find the area of the given triangle. Round your answer to the nearest tenth. Do not round any Intermediate computations. 36° 12 square units
The area of the triangle is 52.32 square units
Finding the area of the trianglefrom the question, we have the following parameters that can be used in our computation:
The triangle
The base of the triangle is calculated as
base = 12 * tan(36)
The area of the triangle is then calculated as
Area = 1/2 * base * height
Where
height = 12
So, we have
Area = 1/2 * base * height
substitute the known values in the above equation, so, we have the following representation
Area = 1/2 * 12 * tan(36) * 12
Evaluate
Area = 52.32
Hence, the area of the triangle is 52.32 square units
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The area of the right triangle is approximately 52.3 square units.
What is the area of the triangle?The area of triangle is expressed as:
Area = 1/2 × base × height
The figure in the image is a right triangle.
Angle θ = 36 degrees
Adjacent to angle θ ( height ) = 12
Opposite to angle θ ( base ) = ?
To determine the area, we need to find the opposite side of angle θ which is the base.
Using trigonometric ratio:
tanθ = opposite / adjacent
tan( 36 ) = base / 12
base = 12 × tan( 36 )
base = 8.718510
Now, area will be:
Area = 1/2 × 8.718510 × 12
Area = 52.3 square units
Therefore, the area of the triangle is 52.3 square units.
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