Acarnival charges $5 for admission plus $2 per ride.

1. write an expression for the cost of admission plus r rides

2. find the cost of admission plus six rides

3. how many rides can you afford if you have $15 to spend?

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

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