If two similar figures have scale factor of 3:5, what is their area ratio

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

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp