I don't understand how to do it without fully solving it. Could someone explain, please?

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?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

Find the slope of the line passing through a pair of points