What’s the correct answer ASAP

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?

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.