Question

A rectangle is 4 times as long as it is wide. If the area of the rectangle is 1600cm^2, what are the dimensions?

Answer 1

dimensions 20cm x80cm

Explanation:

length is 4W of 1W,

LxW=area of 1600

4W x 1W = 1600cm2

divide both by 4 to isolate W

W=400cm2

square root of 400=20

replace W with 20 into equation 4Wx1W

4x20=80

1x20=20

80 is 4x the width of 20