A teenager whose eyes are five feet above graund level is looking into a mirror on the ground and can see the top of the building that is 30 feet away from the teenager.

The angle of elevation from the center of the mirror to the top of the building is 70º.

How tall is the building? How far away from the teenager's feet is the mirror?

answer:

24pi or letter c

2 equivalent expressions to represent the area of a rectangle and the top is n-3 and the side is 2

area of the rectangle = length * width

given length = n - 3

width = 2

replace it in the area

so area of the rectangle = (n-3) *2

= 2(n-3)

one of the expression is 2(n-3)

to get another expression we distribute 2 inside the parenthesis

2(n-3) is 2n - 6

so another expression is 2n - 6

two equivalent expression are

2(n - 3)   , 2n - 6

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