PLEASE SHOW WORK

1) If $100 is deposited every six months for four years at 4 percent, compounded semiannually, what will be the accumulated amount after the last deposit?

2) What sum will a deposit of $500 grow in 10 years, if interest is 8 percent (a) compounded quarterly? (b) compounded continuously?

3) Determine the amount of money you should deposit at the beginning of each month for 15years to accumulate $20,000 if money earns 4% compounded monthly