Your friend has $100 when he goes to the fair. He spends $10 to enter the fair and $20 on food. Rides at the fair cost $2 per ride. Which function can be used to determine how much many he has left over after x rides.
Well, he has $100.. Spends $10 to enter and $20 on food which is a total of $30. He has $70 to spend so each ride cost $2 which means he can ride about 35 rides.
