400 hundreds is the same as 4000

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.

How do i put 3(x+7) in distributive property

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)