Need help with this one is really confusing. i need an explanation with answer

1.

Find the present value of the given future payment at the specified interest rate. $4000 due in 30 years at 5% compounded annually The present value is approximately $ (Round to the nearest cent as needed.)A $151,700 mortgage for 25 years for a new home is obtained at the rate of 9.7% compounded monthly. Find (a) the monthly payment, (b) the interest in the first payment, (c) the principal repaid in the first payment, and (d) the finance charge. (a) The monthly payment on the mortgage is $. (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.)