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? f(x) = 1.25x + 64 f(x) = −16x + $80 f(x) = −1.25x + 64 f(x) = −1.25x − 64