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Keith_Richards [23]
3 years ago
6

What's 6 c ^ 2 + 2.5 D - D + 2C ^ 2 - 3D what is that simplified

Mathematics
1 answer:
adell [148]3 years ago
4 0

I'm assuming that the lower case c and the upper case C are the same variables.

6C^2 + 2.5D - D + 2C^2 - 3D = 8C^2 - 1.5D

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Given:

A pilot can travel 450 miles with the wind in the same amount of time as 360 miles against the wind.

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Let the speed of wind be x miles per hour.

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We know that,

Time=\dfrac{Distance}{Speed}

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\dfrac{450}{315+x}=\dfrac{360}{315-x}

Divide both sides by 90.

\dfrac{5}{315+x}=\dfrac{4}{315-x}

By cross multiplication, we get

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Divide both sides by 9.

\dfrac{(1)315}{9}=x

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Therefore, the speed of wind is 35 miles per hour.

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