If m<1=7x and m<4=3x+20, what is the m<2?

How do you do this geometry problem

What kinds of numbers have an odd number of factors?

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?