After working 6 hours kevin earned $51.00 what is kevin unit rate

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

This is about circle theorems. someone asap : (