Liz earns $9.28 per hour at her part time job. she works 5.5 hours saturday. how much money dose liz earn

For the function, f(x) = -5x 2, find f(-4).

Can someone me and plz do the problem

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.