Oscar saves 40% of his monthly check for college. He earned $450 last month. How much money did Oscar save for college?

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

This is about circle theorems. someone asap : (