Jim, a local surveyor, wants to find the distance across the lake from point A to point B. He located a point Cor found the following distances. AC = 1800 ft DC = 700ft ED = 800 ft BC = 1400ft Find AB in feet.

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