Question

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 costs $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)=-1.25-64