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stira [4]
1 year ago
7

A pilot travel 450 miles with the wind in the same amount of time as 396 miles against the wind. Find the speed of the wind if t

he pilots speed in still air is 235 miles per hour The speed of wind is ?

Mathematics
1 answer:
Anna71 [15]1 year ago
4 0

Let x be speed of wind.

Speed of plane with the wind = 235 + x

Speed of plane against the wind = 235 - x

use the formula,

Distance = (Rate)(Time),

thus,

Time=\frac{Distance}{Rate}

Time to go 450 miles with wind = time to go 396 miles with wind

\begin{gathered} \frac{450}{235+x}=\frac{396}{235-x} \\ 450(235-x)=396(235+x) \\ 105750-450x=93060+396x \\ 105750-93060=396x+450x \\ 12690=846x \\ x=15 \end{gathered}

The speed of the wind is 15 mph.

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MrMuchimi

Answer: Choice C

h(x) = -x^4 + 2x^3 + 3x^2 + 4x + 5

===========================================

Explanation:

When reflecting the function f(x) over the y axis, we replace every x with -x and simplify like so

f(x) = -x^4 - 2x^3 + 3x^2 - 4x + 5

f(-x) = -(-x)^4 - 2(-x)^3 + 3(-x)^2 - 4(-x) + 5

f(-x) = -x^4 + 2x^3 + 3x^2 + 4x + 5

h(x) = -x^4 + 2x^3 + 3x^2 + 4x + 5

Note the sign changes that occur for the terms that have odd exponents (the terms -2x^3 and -4x become +2x^3 and +4x); while the even exponent terms keep the same sign.

The reason why we replace every x with -x is because of the examples mentioned below

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Examples:

The point (1,2) moves to (-1,2) after a y axis reflection

Similarly, (-5,7) moves to (5,7) after a y axis reflection.

As you can see, the y coordinate stays the same but the x coordinate flips in sign from negative to positive or vice versa. This is the direct reason for the replacement of every x with -x.

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2 years ago
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Answer:

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Step-by-step explanation:

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Answer:

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Therefore original price = $580,000

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