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Your friend has $80 when he goes to the fair. He spends $4 to enter the fair and $12 on food. Rides at the fair cost $1.25 per ride. Which function can be used to determine how much money he has left over after x rides?

A) f(x) = 1.25x + 64

B) f(x) = -16x + $80

C) f(x) = -1.25x + 64

D) f(x) = -1.25x - 64

Respuesta :

JcAlmighty
The answer is f(x) = -1.25 + 64

x - number of rides

Let's go step by step:
He had 80$: f(x) = 80
He spends $4 to enter the fair: f(x) = 80 - 4
He spends $12 on food: f(x) = 80 - 4 - 12
Rides at the fair cost $1.25 per ride x: f(x) = 80 - 4 - 12 - 1.25x

f(x) = 80 - 4 - 12 - 1.25x
f(x) = 64 - 1.25x
f(x) = -1.25 + 64

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