7(12b + 9) - b what is the awnser

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.

We just started the introduction into circles and i have no idea how to do this.

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17