Why is it useful to write a ratio of fractions as a unit rate

The unit rate has a denominator of one.This will often modify any subsequent mathematical calculations. Choosing the form of the proportion should really be based on what you're doing with it. Often a denominator apart from 1 is sufficient to follow-up operations that you will need to run.

step-by-step explanation:

i think you should think about the question and not look online.

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