What is the area of a rectangle that is 21 ft wide and 8 ft long? remember: a = l × w.

A=L*W

So L is long which is 8

and W is wide which is 21

so A=8*21 which is 168ft^2

t hope this

:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15