On number 5 i cant figure it do tomorrow

The function models the number of accidents per 50 million miles driven as a function

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.