Intermediate Accounting 1.

I need help with this exercise if its possible. Thanks in advance!

E6-5 (L04) (Computation of Present Value) Using the appropriate interest table, compute the present values of the following periodic amounts due at the end of the designated periods. (a) $30,000 receivable at the end of each period for 8 periods compounded at 12%, (b) $30,000 payments to be made at the end of each period for 16 periods at 9%. (c) $30,000 payable at the end of the seventh, eighth, ninth, and tenth periods at 12%