Someone help me with the steps please

Asphere has a diameter of 10 in. what is the volume of the sphere?

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if