Question

The rectangle below has a total perimeter of 100 ft:

rectangle with width of 9


Which of the following equations can be used to determine the length of the longer side of the rectangle?

x + 9 = 100
2x + 18 = 100
9x = 100
81x = 100

Answer 1

Answer:x + 9 = 100

Explanation:

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Answer 2

B) 2x + 18 = 100

Explanation:

Given: Perimeter = 100 feet and width = 9 ft

We know that the perimeter of a rectangle = 2(length + width)

Let "x" be the length of the rectangle.

Plugging in the given values in the above formula, we get

100 = 2(x + 9)

On the right hand side, we can use the distributive property a(b + c) = ab + ac

and expand.

100 = 2x + 2*9

100 = 2x + 18

This is same as 2x + 18 = 100

Therefore, the answer is B) 2x + 18 = 100