A question in math that has many different answers often in numeric form

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Which fraction below is equivalent to 10/12?

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.