Answers
The expression of the weight carried by x hikers is x (3.4 + 4.6 + 2.2).
The weight carried by each hiker is 10.2 lb.
What is an expression?An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.
Example: 2 + 3x + 4y = 7 is an expression.
We have,
Three items are given.
The weight of each items are 3.4 lb, 4.6 lb, and 2.2 lb.
Now,
The total weight of all the items.
= 3.4 + 4.6 + 2.2
= 10.2 lb
The weight carried by x hikers.
= x (3.4 + 4.6 + 2.2)
= 10.2x lb
The weight carried by each hikers.
= 3.4 + 4.6 + 2.2
= 10.2 lb
Thus,
Weight carried by x hikers is 10.2x lb.
Weight carried by each hiker is 10.2 lb.
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Related Questions
In AABC, AB=32, AC = 23, and BC= 20. What is mZA?
Answers
The measure of m∠A in the triangle is:
m∠A = 38.44°
How to find the measure of m∠A?The cosine rule is used for solving triangles which are not right-angled in which two sides and the included angle are given. The following are cosine rule formula for angles:
cos(A) = (b² + c² − a²)/2bc
cos(B) = (c² + a² − b²)/ 2ac
cos(C) = (a² + b² − c²)/2ab
Where a, b and c are the length of the sides, and A, B, and C are the measures of the angles
We have:
a = BC = 20
b = AC = 23
c = AB = 32
Substituting into:
cos(A) = (b² + c² − a²)/2bc
cos(A) = (23² + 32² − 20²)/(2*23*32)
cos(A) = 0.7833
A = cos⁻¹(0.7833)
A = 38.44°
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hey i have a question about this assignment and want to check if my answers are right
Answers
The value of x from the given triangle with angle 55° and side 27 units is 15.5 units.
A) By using Pythagoras theorem,
x²=16²+6²
x²=292
x=17.1 units
B) By using Pythagoras theorem,
23²=x²+9²
x²=529-81
x²=448
x=21.2 units
C) By using Pythagoras theorem,
10²=x²+8.5²
x²=100-72.25
x²=27.75
x=5.3 units
D) By using Pythagoras theorem,
x²=12²+15²
x²=369
x=19.2 units
E) Here, cos60°=6√3/x
1/2=6√3/x
x=12√3 units
F) Here, cos45°=√10/x
1/√2=√10/x
x=10 units
G) Here, sin60°=30/x
2/√3=30/x
x=15√3 units
H) Here, cos30°=x/16
2/√3=x/16
x=32/√3 units
I) Here, sinx=25/26
x=74°
J) Here, sin45°=x/16√2
1/√2=x/16√2
x=16 units
K) tan34°=x/28
0.6745=x/28
x=18.886
L) tanx°=17/18.5
tanx°=0.9189
x=42.5°
M) Here, cosx=9/12
x=41.4°
N) Here, sin16°=4/x
0.2756=4/x
x=4/0.2756 units
x=14.5
O) Here, cos55°=x/27
0.5735=x/27
x=15.4845
Therefore, the value of x from the given triangle with angle 55° and side 27 units is 15.5 units.
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A plane takes off from an airport andtravels 13 miles on its path.
if the plane is 12 milesfrom its takeoff poin horizontally, what is its height?
Answers
The height of the plane is 5 miles.
To solve this problem, we can visualize it as a right triangle. The horizontal distance traveled by the plane forms the base of the triangle, which is 12 miles. The total distance traveled by the plane forms the hypotenuse of the triangle, which is 13 miles. We need to find the height, which corresponds to the vertical side of the triangle.
Using the Pythagorean theorem, we can calculate the height as follows:
height^2 + 12^2 = 13^2
height^2 + 144 = 169
height^2 = 169 - 144
height^2 = 25
Taking the square root of both sides, we get:
height = √25
height = 5
Therefore, the height of the plane is 5 miles.
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Alfred has a coupon for 35 cents off a 32-ounce bottle of detergent that sells for $1.39. Another brand offers a 20-ounce bottle for 79 cents. If he uses the coupon, which will be the better buy?
Answers
The detergent with the coupon is the better buy since it has a lower price per ounce.
To determine which option is the better buy, we need to compare the prices per ounce for each detergent brand.
First, let's calculate the price per ounce for the 32-ounce bottle of detergent after applying the coupon:
Price per ounce = (Price - Coupon) / Ounces
Price per ounce = ($1.39 - $0.35) / 32
Price per ounce = $1.04 / 32
Price per ounce ≈ $0.0325
Next, let's calculate the price per ounce for the 20-ounce bottle of the other brand:
Price per ounce = Price / Ounces
Price per ounce = $0.79 / 20
Price per ounce = $0.0395
Comparing the two price per ounce values, we can see that the price per ounce for the detergent with the coupon is approximately $0.0325, while the price per ounce for the other brand is $0.0395.
Therefore, the detergent with the coupon is the better buy since it has a lower price per ounce.
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Which system is equivalent to
O
O
O
[5-x=9x²
y = 5-x
[y=9y²-90y+225
1x=y-5
[5+x=9x²
y = 5+x
y = 3x
x+3x=5
y=9x²?
x+y=5
Answers
The first equation is a quadratic equation, and the second equation is a linear equation. The solution to the system is x = -2 and y = 7, which satisfies both equations.
A linear equation is an equation in which the highest power of the variable is always 1. It is also known as a one-degree equation. The standard form of a linear equation in one variable is of the form Ax + B = 0. Here, x is a variable, A is a coefficient and B is constant.
The system that is equivalent to:
O
O
O
[5-x=9x²
y = 5-x
is: x = -2, y = 7
In the given system, the first equation is a quadratic equation, and the second equation is a linear equation. The solution to the system is x = -2 and y = 7, which satisfies both equations.
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A head teacher shared 27 notebooks among 9 students.one of them students found that each of his books combined 155 pages.how many pages were in the books he received
Answers
The number of pages that each book contained is given as follows:
465 pages.
How to obtain the number of pages?The number of pages that each book contained is obtained applying the proportions in the context of the problem.
A head teacher shared 27 notebooks among 9 students, hence the number of the notebooks per student is given as follows:
27/9 = 3 notebooks per student.
One of them students found that each of his books combined 155 pages, hence the number of pages on the book is given as follows:
155 x 3 = 465 pages.
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Find the 9th term of the geometric sequence 4 , − 16 , 64 , . . . 4,−16,64,...
Answers
The 9th term of the geometric sequence 4, -16, 64, ... is 262144.
To find the 9th term of the geometric sequence 4, -16, 64, ... , we need to determine the common ratio (r) of the sequence.
To do this, we can divide any term by its preceding term:
-16 / 4 = -4
64 / -16 = -4
We see that the common ratio (r) is -4.
To find the 9th term, we can use the formula for the nth term of a geometric sequence:
Tn = a * r^(n-1)
Where Tn is the nth term, a is the first term, r is the common ratio, and n is the term number.
In this case, the first term a is 4, the common ratio r is -4, and we want to find the 9th term.
T9 = 4 * (-4)^(9-1)
T9 = 4 * (-4)^8
T9 = 4 * 65536
T9 = 262144
Therefore, the 9th term of the geometric sequence 4, -16, 64, ... is 262144.
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Find the median and mean of the data set below: 9,23,38,45,14
Answers
Answer:
mean, 25.8 median 23
Step-by-step explanation:
Arrange the data in an ascending order and the median is the middle value. If the number of values is an even number, the median will be the average of the two middle numbers.
The mean of a set of numbers is the sum divided by the number of terms.
Focus: (-5,3); Directrix: y = 1
Answers
The equation of the parabola is: y = (1/4)(x-3)²+ 2
In Parabola mathematics, it is defined as a set of points that are equidistant from a fixed point called the focus and a fixed line called the directrix. In this case, we are given the focus (3,5) and the directrix y=1, y=1, and we need to find the equation of the parabola.
To find the equation of the parabola, we first need to determine the vertex. The vertex is the midpoint between the focus and the directrix, which in this case is (3,3). Since the parabola is symmetric, we know that the axis of symmetry passes through the vertex and is perpendicular to the directrix. Therefore, the equation of the axis of symmetry is x=3.
Next, we need to find the distance between a point on the parabola and the focus, as well as the distance between that same point and the directrix. Let (x,y) be a point on the parabola. The distance between (x,y) and the focus is given by the distance formula: √((x-3)² + (y-5)²)
The distance between (x,y) and the directrix is simply the absolute value of the difference between y and 1: |y-1|
Since the point (x,y) is equidistant from the focus and the directrix, we have: √((x-3)²+ (y-5)²) = |y-1|
Squaring both sides and simplifying, we get: (x-3)²= 4(y-2)
Therefore, the equation of the parabola is: y = (1/4)(x-3)²+ 2
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NOTE : I HAVE ANSWERED THE QUESTION IN GENERAL AS GIVEN QUESTION IS INCOMPLETE.
Complete Question : Find the Parabola with Focus (3,5) and Directrix y=1 (3,5) , y=1
Which statement is the converse of the following conditional? If a polygon has three sides, then it is a triangle. A. If a polygon does not have three sides, then it is not a triangle. B. If a polygon is not a triangle, then it does not have three sides. C. If a polygon is a triangle, then it does not have three sides. D. If a polygon is a triangle, then it has three sides.
Answers
Answer:
Step-by-step explanation:
The converse of the conditional statement "If a polygon has three sides, then it is a triangle" is:
D. If a polygon is a triangle, then it has three sides.
In the original conditional statement, the "if" part is "a polygon has three sides," and the "then" part is "it is a triangle." The converse switches the positions of the "if" and "then" parts, resulting in the statement "If a polygon is a triangle, then it has three sides."
Find the area of a triangle with the base of 3x²y2 and a height of 4x4y³. Use the formula: A=bh
Answers
The area of the triangle is 6x³y⁵
What is area of a triangle?The space enclosed by the boundary of a plane figure is called its area.
A triangle is a polygon with three sides having three vertices.
There are different types of triangle, scalene triangle, equailteral triangle, isosceles triangle, right triangle e.t.c
The area of a triangle is expressed as ;
A = 1/2 bh
where b is the base and h is the height of the of the triangle.
Base = 3x²y²
height = 4x4y³
A = 1/2 × 3x²y² × 4x4y³
A = 1/2 × 12x³y⁵
A = 6x³y⁵
Therefore the area of the triangle is 6x³y⁵
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The area of the Triangle is [tex]48x^{3} y^{4}[/tex]
What is Triangle?Triangle is a two-dimensional three-sided polygon, which has three vertices, three sides and three angles. It is a shape formed when three straight lines meet.
How to determine this
Area of triangle = 1/2 base * height as given
Where area of triangle = ?
Base = [tex]3x^{2} y2[/tex]
i.e 3 * 2 [tex]x^{2} y[/tex]
Base, b = [tex]6x^{2} y[/tex]
Height = [tex]4x4y^{3}[/tex]
i.e [tex]4x[/tex] * [tex]4y^{3}[/tex]
Height,b = [tex]16xy^{3}[/tex]
Area of triangle = 1/2 * [tex]6x^{2} y[/tex] * [tex]16xy^{3}[/tex]
Area = 1/2 * 96* [tex]x^{2+1}[/tex] * [tex]y^{1+3}[/tex]
Area = 1/2 * 96 * [tex]x^{3}[/tex] * [tex]y^{4}[/tex]
Area = 48 * [tex]x^{3} y^{4}[/tex]
Area of the triangle = [tex]48x^{3} y^{4}[/tex]
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Given that ∅ = 12.2° , calculate the area of the triange below
give your answer to 2 d.p.
Answers
Answer:
A = (1/4)√(4 + 11 + 14)√(-4 + 11 + 14)√(4 - 11 + 14)√(4 + 11 - 14)
A = (1/4)√29√21√7
= about 16.32 mm²
Answer:
16.27 mm² (see comment)
Step-by-step explanation:
You want the area of a triangle with side lengths 11 mm and 14 mm, and the angle between them 12.2°.
AreaThe area is given by the formula ...
A = 1/2ab·sin(C)
A = 1/2(11 mm)(14 mm)·sin(12.2°) ≈ 16.27 mm²
The area of the triangle is about 16.27 square millimeters.
__
Additional comment
If you use Heron's formula for the area from the three side lengths, you find it is about 16.32 mm². That's the trouble with over-specified geometrical figures. The result you get depends on which of the given values you use. (To get the area accurate to 4 sf, the angle needs to be specified to 4 sf: 12.24°.)
s = (4 +11 +14)/2 = 14.5
A = √(s(s -a)(s -b)(s -c))
A = √(14.5(14.5 -4)(14.5 -11)(14.5 -14)) = √(14.5·10.5·3.5·0.5) = √266.4375
A ≈ 16.32
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ANSWER ASAP!! (GIVING BRAINLIEST IF CORRECT!!)
Karen measures the width of a garden plot and records that it is 40 meters. Its actual width is 42 meters.
What is the percent error in the measurement?
A: 2%
B: 3%
C: 4%
D: 5%
Answers
Explanation:
The error is 42-40 = 2 meters
Divide this over the actual width
2/42 = 0.0476 = 4.76% approximately
This rounds to 5%
Answer:
D. 5%
Step-by-step explanation:
Percent Error = (|40 - 42| / 42) × 100
Percent Error = (2 / 42) × 100
Percent Error ≈ 4.76%
Do it please i will reward brainlest
Answers
Answer:
Step-by-step explanation:
The total cost of a tie and a pair of pants was $87.18. If the price of the tie was $2.12 less than the pair of pants, what was the price of the tie?
Answers
This is a linear equation problem with two variables. One way to solve it is by using the substitution method. Let x be the price of the tie and y be the price of the pair of pants. Then we have:
$$
\begin{aligned}
x + y &= 87.18 \\
x &= y - 2.12
\end{aligned}
$$
Substituting x into the first equation, we get:
$$
\begin{aligned}
(y - 2.12) + y &= 87.18 \\
2y - 2.12 &= 87.18 \\
2y &= 89.30 \\
y &= 44.65
\end{aligned}
$$
Therefore, the price of the pair of pants is $44.65. To find the price of the tie, we plug y into the second equation:
$$
\begin{aligned}
x &= y - 2.12 \\
x &= 44.65 - 2.12 \\
x &= 42.53
\end{aligned}
$$
Therefore, the price of the tie is $42.53.
Answer:
42.53
Step-by-step explanation:
write equation
tie + pants = 87.18
since ties cost 2.12 less than pants,
tie = pants -2.12
now substitute back into first equation
pants - 2.12 + pants = 87.18
solve for pants by adding 2.12 to the other side
divide by 2 since there are 2 pants on one side
find pants and then substitute value into the tie equation to find the price of the tie
4. The wheels of a bicycle have a
diameter of 22 inches. How many
full revolutions will the wheels need
to make to travel 300 feet? Use 3.14
for .
A 105 revolutions
B 10 revolutions
C164 revolutions
D 53 revolutions
no
Answers
53 revolutions will be needed by the wheels to make it travel 300 feet.
Option D is the correct answer.
We have,
To solve this problem, we can use the formula:
Number of revolutions = Distance / Circumference of the wheel
First, let's convert the distance from feet to inches:
300 feet = 300 x 12 = 3600 inches
Next, we need to calculate the circumference of the wheel using the given diameter:
Circumference = π x diameter
Circumference = 3.14 x 22 inches
Circumference ≈ 69.08 inches
(rounded to two decimal places)
Now we can calculate the number of revolutions:
Number of revolutions = 3600 inches / 69.08 inches
= 52.14 revolutions
Rounding to the nearest whole number.
= 52 revolutions.
Therefore,
53 revolutions will be needed by the wheels to make it travel 300 feet.
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The bicycle wheels will need 53 full revolutions to travel 300 feet.
The circumference of a wheel can be calculated using the formula:
circumference = π x diameter
So, circumference = 3.14 x 22
= 69.08 inches
Now, converting feet to inches
300 feet = 300 x 12 inches
300 feet = 3600 inches
So, number of revolutions:
revolutions = distance / circumference
= 3600 / 69.08
≈ 52.11
Therefore, the bicycle wheels will need 53 full revolutions to travel 300 feet.
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if 4.2 pounds of strawberry sells for an income of $12 what is 24,990 pounds income
Answers
Answer: $71,400
Step-by-step explanation:
We will set up a proportion with income in the numerator and pounds in the denominator.
[tex]\displaystyle \frac{\$12}{4.2\;lbs} =\frac{\$x}{24,990\;lbs}[/tex]
Then we will cross-multiply.
4.2 * x = 12 * 24,990
4.2x = 299,880
Lastly, we will divide both sides of the equation by 4.2.
x = $71,400
The income from 24,990 pounds of strawberries would be approximately $71,690.14.
To find the income from 24,990 pounds of strawberries, we need to use a proportion:
4.2 pounds of strawberries sells for $12, so 1 pound of strawberries sells for $12/4.2 = $2.86 (rounded to two decimal places).
Therefore, 24,990 pounds of strawberries would sell for:
$2.86 x 24,990 = $71,690.14 (rounded to two decimal places).
5
Enter the correct answer in the box.
Solve the quadratic equation by completing the square.
2x² + 12x = 66
Fill in the values of a and b to complete the solutions.
x=a-√b
x=a+√b
Answers
The values of a and b are a = -3 and b = 42. The solutions for x can be written as:
x = -3 - √42
x = -3 + √42
To solve the quadratic equation 2x² + 12x = 66 by completing the square, we need to follow these steps:
Step 1: Move the constant term to the right side:
2x² + 12x - 66 = 0
Step 2: Divide the equation by the leading coefficient (2):
x² + 6x - 33 = 0
Step 3: To complete the square, we take half of the coefficient of x, square it, and add it to both sides of the equation:
x² + 6x + (6/2)² = 33 + (6/2)²
x² + 6x + 9 = 33 + 9
x² + 6x + 9 = 42
Step 4: Rewrite the left side as a perfect square:
(x + 3)² = 42
Step 5: Take the square root of both sides:
√(x + 3)² = ±√42
x + 3 = ±√42
Step 6: Solve for x:
x = -3 ± √42.
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Can anyone help me answer this question?
Define y as an explicit function of x; x + y + y^2 = x^2
Answers
We have two explicit functions of x for y:
[tex]y = -1/2 + \sqrt{(x^2 - x + 1/4)} \\or\\y = -1/2 - \sqrt{(x^2 - x + 1/4)}[/tex]
To define y as an explicit function of x, we need to solve for y in terms of x in the given equation:
[tex]x + y + y^2 = x^2[/tex]
First, let's simplify the equation by moving all the terms to one side:
[tex]y^2 + y + (x - x^2) = 0[/tex]
Now, we can use the quadratic formula to solve for y:
[tex]y = (-b + \sqrt{(b^2 - 4ac)} ) / 2a[/tex]
where a = 1, b = 1, and [tex]c = x - x^2.[/tex]Substituting these values, we get:
[tex]y = (-1 + \sqrt{(1 - 4(x - x^2)} )) / 2[/tex]
Simplifying further:
[tex]y = (-1 + \sqrt{(1 - 4x + 4x^2)} ) / 2\\y = (-1 + \sqrt{(4x^2 - 4x + 1)} ) / 2\\y = (-1 + 2\sqrt{(x^2 - x + 1/4)} ) / 2\\y = -1/2 + \sqrt{(x^2 - x + 1/4)}[/tex]
Therefore, we have two explicit functions of x for y:
[tex]y = -1/2 + \sqrt{(x^2 - x + 1/4)} \\or\\y = -1/2 - \sqrt{(x^2 - x + 1/4)}[/tex]
Either of these expressions represents y as an explicit function of x.
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Below are two inequalities and the graphs of their without the shading. By imagining where the shading should be, identify which point would satisfy BOTH
inequalities
Answers
Answer: C
Step-by-step explanation:
Answer:
D. (-2, 10)
Step-by-step explanation:
Given inequalities:
[tex]y > -\dfrac{5}{3}x+2[/tex]
[tex]y > 3x+2[/tex]
Both inequalities have been given in slope-intercept form, y = mx + b, where m is the slope and b is the y-intercept.
The first equation has a negative slope, which means that as x increases, y decreases. Therefore, it is the dashed line that begins in quadrant II and ends in quadrant IV.
The second equation has a positive slope, which means that as x increases, y increases. Therefore, it is the dashed line that begins in quadrant III and ends in quadrant I.
When graphing inequalities, the inequality sign ">" indicates a dashed line and shading above the line.
As both inequalities should be shaded above the lines, the region where the shaded regions overlap is the upper "V" of the graph (see attachment).
A point that satisfies both inequalities is any point that is located in the overlapping shaded region, but not found on the dashed lines.
Therefore, the point that satisfies both inequalities is (-2, 10).
Determine the value of real parameters p in such a way that the equation 3x2−24x+p=0 has one root equal to triple of the second root
has one root equal to triple of the second root.
Answers
The value of the parameter p that satisfies the given conditions is 36.
Let the roots of the quadratic equation [tex]3x^2 - 24x + p = 0[/tex] be denoted by α and β, where α is the root that is triple the value of β.
Then we have:
α = 3β
The sum and product of the roots of the quadratic equation are given by:
α + β = 8 (from the coefficient of x in the linear term)
αβ = p/3 (from the constant term)
Substituting α = 3β in the first equation gives:
3β + β = 8
4β = 8
β = 2
Therefore, α = 6.
So the roots of the quadratic equation are α = 6 and β = 2.
The product of the roots is:
αβ = 6 × 2 = 12
From the equation αβ = p/3, we have:
p/3 = 12
p = 36
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Apples cost $1.29 per pound. How much would a bag of apples weighing 4.7 pounds cost? (Round your answer to the nearest cent.)
Answers
Answer:
$6.06
Step-by-step explanation:
$1.29 x 4.7 = 6.063
Round: 6.06
You Draw two marbles (without replacement) from a bag containing 4 green 2 yellow and 6 red marbles.what is the probability that both marbles are yellow? round to the nearest thousand
Answers
The probability of drawing two yellow marbles is 0.015 to the nearest thousandth.
What is the probability?The probability of drawing two yellow marbles after drawing a yellow marble on the first draw and without replacement drawing another yellow marble is determined as follows:
Total number of marbles in the bag = 4 + 2 + 6
Total number of marbles in the bag = 12 marbles in the bag.
P(Yellow on first draw) = 2/12 or 1/6
P(Yellow on second draw | Yellow on first draw) = 1/11
The probability of both marbles being yellow will be:
P(Both marbles yellow) = (1/6) * (1/11)
P(Both marbles yellow) = 1/66 or 0.015
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Suppose the prices of a certain model of new homes are normally distributed with a mean of 150,000. Use the 68-95-99.7 rule to find the percentage of buyers who paid between $149,000 and $151,000 if the standard deviation is $1000
Answers
The percentage of buyers is approximately 68.26% of buyers of new houses paid between [tex]$149,000[/tex] and [tex]$151,000[/tex] .
We are given that the prices of the new homes are normally distributed with a mean of [tex]$150,000[/tex] and a standard deviation of $1000.
Using the 68-95-99.7 rule, we know that: approximately 68% of the data falls within one standard deviation of the mean approximately 95% of the data falls within two standard deviations of the mean, approximately 99.7% of the data falls within three standard deviations of the mean.
In order to determine the proportion of customers who spent between $149,000 and , we must first determine the z-scores for these values:
z1 = (149,000 - 150,000) / 1000 = -1 z2 = (151,000 - 150,000) / 1000 = 1
Now, we can determine the proportion of data that falls between z1 and z2 using the z-table or a calculator. The region to the left of z1 is 0.1587, and the area to the left of z2 is 0.8413, according to the z-table. Thus, the region bounded by z1 and z2 is:
0.8413 - 0.1587 = 0.6826
We can get the percentage of consumers who spent between by multiplying this by 100% is [tex]$149,000[/tex] and [tex]$151,000[/tex]:
0.6826 x 100% = 68.26%
Therefore, the standard deviation of customers who paid between is [tex]$149,000[/tex] and [tex]$151,000[/tex] for this model of new homes.
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Plsss help plsss help
Answers
Answer:
It's B
Step-by-step explanation:
Look at the sides with the number compare them with each other and you will find they are the most similar ones with each other.
Consider this equation.
cos(0) = 4/41
If 0 is an angle in quadrant IV, what is the value of sin(0)
Answers
Answer: sin(0) = 40.804/41
Step-by-step explanation:
When comparing the f(x) = –x2 + 2x and g(x) = log(2x + 1), on which interval are both functions positive
(–∞, 0)
(0, 2)
(2, ∞)
(–∞, ∞)
Answers
Answer:
They are both positive on (2, ∞)
Step-by-step explanation:
g(x) > 0
log(2x + 1) > 0
2x + 1 > 0
x > –1/2
(-1/2, ∞)
PLEASE HELP WITH SURFACE AREA!! This is my project and I need the awnser quick!! Pls help me marking brainliest if the awnsers r right !
Answers
The surface areas and volumes of the solids are listed below:
Case 1: A = 118 cm², V = 70 cm³
Case 2: A = 121.5 in², V = 91.125 in³
Case 3: A = 192 m², V = 144 m²
Case 4: A = 480 ft², V = 576 ft³
Case 5: A = 87.965 yd², V = 62.832 yd³
How to determine the surface area and the volume of solidsIn this problem we need to determine the surface area and the volume of each solid. The surface area is the sum of the areas of all faces. The area and volume formulas required to answer this question are shown below:
Area
Rectangle
A = w · l
Triangle
A = 0.5 · w · l
Circle
A = π · r²
Lateral face of a cylinder
A = 2π · r · h
Volumes
Prism
V = A · h
Where:
w - Widthl - Lengthh - Heightr - RadiusA - Base area.Now we proceed to determine the surface areas and volumes of the solids:
Case 1
A = 2 · [(5 cm) · (7 cm) + (5 cm) · (2 cm) + (7 cm) · (2 cm)]
A = 2 · (35 cm² + 10 cm² + 14 cm²)
A = 2 · 59 cm²
A = 118 cm²
V = (5 cm) · (7 cm) · (2 cm)
V = 70 cm³
Case 2
A = 6 · (4.5 in)²
A = 121.5 in²
V = (4.5 in)³
V = 91.125 in³
Case 3
A = 2 · 0.5 · (8 m) · (6 m) + (6 m) · (10 m) + (6 m)² + (8 m) · (6 m)
A = 192 m²
V = 0.5 · (8 m) · (6 m)²
V = 144 m²
Case 4
A = 2 · 0.5 · (12 ft) · (8 ft) + 2 · (10 ft) · (12 ft) + (12 ft)²
A = 480 ft²
V = 0.5 · (12 ft) · (8 ft) · (12 ft)
V = 576 ft³
Case 5
A = 2π · (2 yd)² + 2π · (2 yd) · (5 yd)
A = 87.965 yd²
V = π · (2 yd)² · (5 yd)
V = 62.832 yd³
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Which model represents the expression 87 - 42?
Answers
The model that represents the expression 87 - 42 is (d)
Identifying the model that represents the expression 87 - 42?From the question, we have the following parameters that can be used in our computation:
87 - 42
Using their place values, we have
87 = 8 tens 7 units
42 = 4 tens 2 units
This means that
87 - 42 = 8 tens 7 units - 4 tens 2 units
Subtract the tens
87 - 42 = 4 tens 7 units - 2 units
Subtract the units
87 - 42 = 4 tens 5 units
The model that represents the expression 87 - 42 is 4 tens 5 units
This is represented by model (d) bottom right
Hence, the model that represents the expression 87 - 42 is (d)
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Mrs. Garcia invests a total of $6331 in two savings accounts. One account yields 8.5% simple interest and the other 8% simple interest. Find the amount placed in each account if she receives a total of $517.68 in interest after one year.
Answers
Mrs. Garcia invested $2240 in the 8.5% account and $4091 in the 8% account.
Let x be the amount invested in the 8.5% account, and y be the amount invested in the 8% account. Since the total investment is $6331, we have x + y = 6331.
The total interest received is $517.68, which can be expressed as 0.085x + 0.08y = 517.68, where 0.085 and 0.08 are the decimal equivalents of the interest rates.
We can now solve this system of equations to find x and y. One possible method is to use substitution, where we solve for one variable in terms of the other from one of the equations, and substitute it into the other equation. From x + y = 6331, we have y = 6331 - x. Substituting this into the second equation, we get:
0.085x + 0.08(6331 - x) = 517.68
Simplifying and solving for x, we get:
0.005x + 506.48 = 517.68
0.005x = 11.2
x = 2240
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