Ineed with these 4 problems. due tomorrow ! you : ) 15 points!

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?

How do you solving the solution of each system using elimination?

9/10 divide by -3/15 as a mixed number