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#
Question:

Amy wants to fence in a yard using 400 feet of fencing. If she wants the yard to be 30-feet wide, how long will it be?

A
170 feet

Explaination

The formula used to determine the perimeter of a rectangle is P = 2(L + W). The width is 30, and the parameter is 400. 400 = 2(L + 30).

400 = 2L + 60

340 = 2L

L = 170