please hell witth these questions

4) How long will it take a $4,000 investment to grow to $7,000 if it earns 5% compounded semiannually? Show " N " with two places after the decimal. Round your final answer up and state in months. 5) A store credit card states an annual interest rate of 24.99%. If outstanding balances are compounded daily, what is the effective rate of interest? 6) Hannah plans to invest $175 at the end of each month into an RRSP for the next 6 years. If she earns 6% compounded monthly, what will be her balance at the end of the 6 years? How much interest was earned