Question

a flat rectangular piece of aluminum has a perimeter of 66 inches. the length is 9 inches longer than the width. find the width.

30 inches 12 inches 21 inches 31 inches

Answer 1

let the width be w

and the length w + 9

so the perimeter is

P = w + w + w+9 + w +9

or

P = 4w + 18

if the perimeter is 66

then

66 = 4w + 18

you now need to solve for w