Please help me with 7-12

Use the distributive law to multiply. 3(4x + 5y + 6)

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.

Which of the following is not a subset of {1,2,3}?