show to work with formulas plz. do not use excel. also plz try to explain clearly as you go. I am very confused about this problem

12. Payments of $100 per quarter are made from June 7, Z through inclusive. If the nominal rate of interest convertible quarterly is 6%. a) Find the present value on September 7,Z-1. b) Find the current value on March 7,Z+ 8. c) Find the accumulated value on June 7, Z 12