can it be explained by telling me what functions to use on my ti 83 plus calculator?

Question 20 (8 points) a) Suppose the interest rate is 6.6% per year compounded monthly. Compute the amount Sarah must deposit in an account today so that she can pay herself $350 per month for the next eleven years. b) How much must Sarah deposit today if she wants to pay herself at the beginning of each month? (Remember that for any credit you must show all your work.) - Format B IU