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lys-0071 [83]
3 years ago
14

a can do.a piece of work in 6 days and B in 8 days each working 7hours a day In what time will they finish it together, working

8hrs a day
Mathematics
1 answer:
Irina-Kira [14]3 years ago
6 0
<h2>A can complete the work in 7*6 hrs = 42 hrs. </h2><h2> </h2><h2>A can complete in 1 hr = 1/42 part. </h2><h2> </h2><h2>B can complete the work in 7*8 hr = 56 hrs. </h2><h2> </h2><h2>A&B together do in 1 hr = 1/42 + 1/56 = 7/168 = 1/24 part. So they will do in 8 hrs = 8*1/24 = 1/3 part. </h2><h2> </h2><h2>Hence they need 1÷1/3 = 3 days to complete the work.</h2>

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Answer:

y = -5x + 20

Step-by-step explanation:

Lets start with the first given values for x and y

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Lets try out the first equation

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This equation wouldn't work because the y value is not 10 when the x value is 2

y = 5x + 20

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This equation doesn't work either

y = -5x + 20

y = -5(2) + 20

y = -10 + 20

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This would be the correct equation since your y value is 10 when the x value is 2

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Step-by-step explanation:

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2 years ago
Francesca is looking at an airplane. She measures the angle at which she is looking up and finds it to be 55 degrees. If the air
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<h2>Answer:</h2>

Option: B is the correct answer.

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<h2>Step-by-step explanation:</h2>

The angle of elevation is: 55 degree

We model this problem by taking a right angled triangle such that the side opposite to the 55 degree is of length 30000 feet.

Now let us consider x denote the distance of the plane from Francesa.

i.e. x denote the hypotenuse of the right angled triangle.

Hence, in right angled triangle i.e. ΔABC we have:

\sin 55=\dfrac{30000}{x}\\\\i.e.\\\\x=\dfrac{30000}{\sin 55}\\\\i.e.\\\\x=\dfrac{30000}{0.81915}\\\\\\i.e.\\\\\\x=36623.2376\ feet

Round to the nearest feet we get: x=36,623 feet

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Step-by-step explanation:

<u>Total for the first choice:</u>

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<u>Total for the second choice:</u>

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Answer:

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