$500 at a simple interest rate of 3% for 4 years. Find the balance

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.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Factor and solve to find roots x squared -x - 90 =0