Help!! i don’t know geometry

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 are the first 4 terms in the multiplication pattern given by the formula 2×4n

Hello, i need compare km^2 and km. what's difference in this?