Find shaded area of the circle. Please help!

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?

5/6+7/8what is the answer sealsdbdbshd

What is the domain of the step function f(x)=[2x]-1?