A hardware store rents vacuum cleaners that customers may use for part or all of a day, before returning. The store charges a flat fee plus an hourly rate. Choose the linear function f for the total rental cost of a vacuum cleaner.

Total rental cost is:

y = Bx + M

where x is number of additional hours, y is total cost, M is fixed fee, and B are is amount that is charged per hour.

Step-by-step explanation:

Let amount of flat fee = M

let hourly rate = B

Total rental cost = ?

As given the store charges a flat fee plus an hourly rate:

⇒ y = Bx + M

where x is number of additional hours, y is total cost, M is fixed fee, and B are is amount that is charged per hour.