Paul is going to have the exterior of his home painted. painting usa charges $75.00 to come out and evaluate the house plus $25.00 per hour of labor. upscale home painting does not charge to evaluate the house. however, they charge $40.00 per hour.

-60.75

step-by-step explanation:

just add the numbers then put the negative sign on it

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