The number of school buses needed to transport students on a field trip is given by the function f(x) = where x represents the number of students going on the trip. What is the domain of this
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function?
A. 'x is the set of all real numbers.
B. x is the set of all integers.
c. x is the set of all nonnegative integers.
D. x is the set of all nonnegative real numbers.

Answer is C

I don't know properly

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step-by-step explanation:

payback

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