Can someone help with this?

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

Hi, can anyone show me how to do this problem? 100 points for this. in advance