Compute the total cost of 1000 gallons of each

the monthly balance will be $75,000

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

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.

it has to have an angle of 90 degrees