Consider the net of a triangular prism where each unit on the coordinate plane represents ten feet. if a can of spray paint covers 50 square feet, how many cans of spray paint are needed to paint the outside of the prism red?
a) 8 cans
b) 10 cans
c) 12 cans
d) 15 cans

i think the answer is b.

step-by-step explanation:

not 100% sure though.

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