What the rate of change of function A

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.

What is 140 squared pleas me i am dumb

An expression for the average of x 2x and 3y