Question

The perimeter of a rectangle is 42 inches. If the width of the rectangle is 6 inches, what is the length?

reminder: perimeter is distance around an object- length + width + length + width

12 inches

15 inches

21 inches

40 inches

Answer 1

15 inches

Explanation:

42 = 2L + 2(6)

first, we need to isolate L.

solve 2(6) to make this easier

42 = 2L + 12

42 - 12 = 2L + 12 - 12 ( this cancels out 12. )

30 = 2L

30 ÷ 2 = 2L ÷ 2 ( this cancels out 2. )

15 = L