It would have taken the two companies approximately 10.92 years to drill the tunnel.
The Loetschberg tunnel was built to connect Bern, Switzerland, with the ski resorts in the southern Swiss Alps. The construction of the tunnel was accomplished by two engineering companies that started at the north end and the south end, respectively. If the company at the north end could drill the entire tunnel in 22.2 years, and the south company could do it in 21.8 years, we can calculate the length of time required for the two companies to drill the tunnel.To calculate the time required for the two companies to drill the tunnel, we can use the following formula:Time = (AB)/(A+B)where A is the time required by the first company, and B is the time required by the second company, and AB is the product of A and B.Using this formula, we can calculate the time required for the two companies to drill the tunnel as follows:Time = (22.2 × 21.8) / (22.2 + 21.8)= 480.36 / 44= 10.92 yearsTherefore, it would have taken the two companies approximately 10.92 years to drill the tunnel.
Learn more about Approximate here,what is to find an approximate value for a number is called?
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What is the area of this?
Answer:
49 cm²
Step-by-step explanation:
Select one or more expressions that together represent all solutions to the equation.
sin(x)=-0.7
Answer:
A. [tex]x_{1} = -44.427^{\circ}\pm n\cdot 360^{\circ}[/tex]
B. [tex]x_{2} = -135.573^{\circ}\pm n\cdot 360^{\circ}[/tex]
Step-by-step explanation:
The negative value of the sine function indicates that [tex]x[/tex] is located at third and fourth quadrants. Besides, this function has a period of 360º. There are two families of solutions:
[tex]x_{1} = \sin^{-1} (-0.7)[/tex]
[tex]x_{1} = -44.427^{\circ}\pm n\cdot 360^{\circ}[/tex]
[tex]x_{2} = \sin^{-1} (-0.7)[/tex]
[tex]x_{2} = -135.573^{\circ}\pm n\cdot 360^{\circ}[/tex]
Hence, right answers are A and B.
hi hello! please help me.
Answer:
x= -4
Step-by-step explanation:
hope it's helpful to you
Answer:
A) x= -4
Step-by-step explanation:
To solve you must isolate the variable. Do this by using the properties of equality to subtract and divide numbers from both sides of the equation. First, subtract 8x to move all x terms to the right side.
-48=12x
Then, divide both sides by 12
-4=x
Write the equation for this line in slope-intercept form.
y=-2x+?
A. -4
B. 2
C. -2
D. -1/2
Please explain as simply as you can I'm really struggling. Also will give brainly
Answer:
The answer is A. -4.
Step-by-step explanation:
The missing value you are looking for is the y-intercept or where the line crosses the y axis.
A number cube is numbered 1 through 6. What is the theoretical probablity of rolling an even number?
is this right if it's not can you help me please
Answer:
I think its right. It look good to me. But always make sure its right before submitting
PLEASE IF U KNOW ANSWER HELP ME I NEED IT IN NEXT 10 MINUTES
Answer:
x + 2y - 3 = 0
Step-by-step explanation:
Coordinates of the points P and Q are (-3, 0) and (0, 6) respectively.
Slope of PQ = (0- 6)/(-3 - 0) = - 6/-3 = 2
Slope of line perpendicular to PQ = - 1/2
Since, required line passes through point R(7, - 2) and is perpendicular to PQ.
Therefore, equation of line in point slope form is given as:
[tex]y - (-2) = - \frac{1}{2} (x - 7) \\ \\ y + 2 = - \frac{1}{2} (x - 7) \\ \\2(y + 2) = - (x - 7) \\ \\ 2y + 4 = - x + 7 \\ \\ 2y + 4 + x - 7 = 0 \\ \\ x + 2y - 3 = 0[/tex]
Therefore x + 2y - 3 = 0 is the required equation of line.
Answer:
Answer:
x + 2y - 3 = 0
Step-by-step explanation:
Coordinates of the points P and Q are (-3, 0) and (0, 6) respectively.
Slope of PQ = (0- 6)/(-3 - 0) = - 6/-3 = 2
Slope of line perpendicular to PQ = - 1/2
Since, required line passes through point R(7, - 2) and is perpendicular to PQ.
Therefore, equation of line in point slope form is given as:
\begin{gathered}y - (-2) = - \frac{1}{2} (x - 7) \\ \\ y + 2 = - \frac{1}{2} (x - 7) \\ \\2(y + 2) = - (x - 7) \\ \\ 2y + 4 = - x + 7 \\ \\ 2y + 4 + x - 7 = 0 \\ \\ x + 2y - 3 = 0\end{gathered}
y−(−2)=−
2
1
(x−7)
y+2=−
2
1
(x−7)
2(y+2)=−(x−7)
2y+4=−x+7
2y+4+x−7=0
x+2y−3=0
Therefore x + 2y - 3 = 0 is the required equation of line.
hope it helps you
Someone please help!
Answer:
12 and 21
Step-by-step explanation:
Inequality from graph
Choose the inequality that represents the following graph.
MY
Cou
-5
14
13
12
+
5
1
0
1
2
3
4
MY
Choose 1 answers
Pro
21
Pro
Теа
2011
2-1
2-1
Hi
Answer:
A. x < -1
Step-by-step explanation:
Because the direction of the vector is less than -1 and the dot on -1 isn't filled (not equal to)
Answer:
option a and b is the inequality that represents the following grap
Which of the following sets of side
lengths would not form a triangle?
A 29, 39, 69
B 29, 38, 49
C 29, 41, 19
D 29, 37, 10
Answer:
A
Step-by-step explanation:
Because 29+39=68
68<69
therefore this would not make a triangle!
Answer:
A.
Step-by-step explanation:
29 + 39 = 68 which is less than 69 so A is not a triangle.
Need help ASAP
Thankss + BRAINLIST only for correct answer
Answer:
y = 4Step-by-step explanation:
x + 2y = 10 ⇒ 2y - 10 = -x
-x + 4y = 14
2y - 10 + 4y = 14
6y = 24
y = 4
help asap look at ss
Answer:
they are 3
Step-by-step explanation:
Please help me :(.......
Answer:
He makes £470 profit
Step-by-step explanation:
He pays $160 for 60 jumpers.
He sells 80% (48) for $12 each. Income of $576
He puts the remaining (12) on sale for one full one half off.
He sells 3 for half price ($6) and 3 for full price ($12) Income of $54
$576 + $54 = $630
$630 - $160 = $470
In pounds sorry about the USD
sole this question ?
30÷5+(9×5)-3²=
Answer:
30÷5+(45)-96+45-942I do exams and quizzes if ur interestedAnswer:
42
Step-by-step explanation:
30/5 + ( 9)(5)−32
= 6 + ( 9)(5)−32
= 6 + 45−32
= 51 − 32
= 51 − 9
= 42
hope I helped!!
is y = -x a proportional relationship
Answer:
For any proportional relationship, k=yx (such as a line that passes through the origin). Find the equation of the line by solving for y in the constant of proportionality equation. This equation y=kx is another representation of a proportional relationship.
Step-by-step explanation:
Answer:
Yes kdsjsbahajajsjsbsbsbsnsn
Which expression represents the algebraic phrase "nine times a number plus thirteen"? 9 minus y + 13 9 + y minus 13 9y + 13 13y + 9
Answer:
dddddddddddddv
Step-by-step explanation:
a train travels 16 miles in 20 minutes . at this rate how many minutes will it take to tavel 12 miles
Answer:
15 minutes
Step-by-step explanation:
distance = rate · time
16 = 20r
r = 16/20 or 4/5 miles per minute
12 = 4/5·t
4t = 12·5
t = 60/4 or 15 minutes
I got it wrong and I don't have time to fix it, I don't know how to delete my response do just report this I guess ;-;
I will mark you brainliests help me with this please
Answer:
[tex]G=cos(x) -1[/tex]
A recipe uses 3/8 cup of water and 2 cups of flour. Write the ratio of water to flour as described by the recipe. Then find the value of the ratio. PLEASE HELP
Answer:
2.29*20 = 45.80 and 3.49*35 = 122.15.
Step-by-step explanation:
56 boys and 34 girls visit a zoo.
46 of these children have a voucher.
Three times as many boys as girls do not have a voucher.
Complete the frequency tree.
Answer:
the amount of boys that HAVE a voucher is 23
the amount of girls that HAVE a voucher is 23
Step-by-step explanation:
Answer: follow for more answers concerning maths, biology physics and chemistry
Step-by-step explanation:
simplify Cos(a+b) +Cos(a+b)
Reasoning. A salesperson's commission rate is 6%. What is the commission from the sale of $35,000 worth of furnaces? Use pencil and paper. Suppose sales would double. What would be true about the commission? Explain without using any calculations.
Answer:2,100
Step-by-step explanation:
Larry's small business has $60,000 dollars in its account and makes automatic
monthly payments that total $12,000.
Answer:
nice flex
Step-by-step explanation:
1) Find the linear equation from the
graph:
Answer:
y = -1/2 x - 3
Step-by-step explanation:
Use the coordinates from the graph:
(-6, 0) and (0, -3)
Slope m = -3-0/0-(-6)
m = -3/6
m = -1/2
The y-intercept is -3 (point where the line meet the y intercept)
Substitute unto the expression y = mx+c
y = -1/2 x - 3
Hence the required equation is y = -1/2 x - 3
Simplify the expression. -6 1/3-1/2(1/2+x)
Answer:
-79/12 - x/2
Step-by-step explanation:
Simplify ⏬
find x=, if x+4=10 please hurry!!!
The answer is x= 6
6 + 4 is = 10.
Answer:
x=6
Step-by-step explanation:
+4=10
+4-4=10−4
x=6
G(x)=-x-3, find g(1)
Answer:
G(1) = -2
Step-by-step explanation:
for G(1) replace x with 1
G(1)=1-3
subtract
1-3 = -2
so G(1) = -2
Write a Haiku about science please! Have a great day :)
Answer:
in Earth, space, the trees
science is all around us
answer life's questions
Step-by-step explanation:
Haikus must be written with 5 syllables in the first line, 7 in the second, and 5 again in the 3rd, so they are naturally limited and simplistic. Hope this helps, and brainliest is always appreciated! Enjoy your day bro!
2/16 2 + x = 12
what is the answer to this equation?
Answer:
nomelase pero será chida la imagen que tienes
the next term of the square 3 by 1
9514 1404 393
Answer:
(B) 1/27
Step-by-step explanation:
The terms of the sequence have a common ratio.
(1/8)/(3/16) = (2/16)/(3/16) = 2/3
(1/12)/(1/8) = (2/24)/(3/24) = 2/3
(1/18)/(1/12) = 12/18 = 2/3
The next term will be ...
(1/18)(2/3) = 2/54 = 1/27 . . . . matches choice B