Your friend has $90 when he goes to the fair. He spends $5 to enter the fair and $15 on food. Rides at the fair cost $1.50 per ride. Which function can be used to determine how much money he has left over after x rides?
f (x) = 1.5x + 70
f (x) = - 1.5x + 70
f (x) = - 1.5x - 70
f (x) = - 20x + $90
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