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2 years ago

14

A building 50 feet tall casts a 75 foot shadow. sarah casts a 6 foot shadow. the triangle formed by the building and its shadow

is similar to the triangle formed by sarah and her shadow. how tall is sarah?

1 answer:

Rufina [12.5K]2 years ago

6 0

Easy.
50/75=x/6
cross multiply
x=4

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Answer: 14x^2 - 84x - 7

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

Explanation:

The like terms 6x^2 and 8x^2 combine to 14x^2

The like terms -8x and -76x combine to -84x

Nothing pairs with the -7, so its stays as is.

Standard form is where we list the terms in decreasing exponent order. We can think of -84x as -84x^1 and the -7 as -7x^0. So 14x^2 - 84x - 7 would be the same as 14x^2 - 84x^1 - 7x^0. The exponents count down: 2,1,0.

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You have D dollars to buy fence to enclose a rectangular plot of land (see figure at right). The fence for the top and bottom co

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The perimeter of the rectangular plot of land is given by the expression below

$P=2x+2y$

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Furthermore, the area of the enclosed land is given by

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