Maurice and three of his friends have a lemonade stand. they want to make enough money so that after splitting the earnings evenly each person earns $12

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?

Ineed i been stuck on this question since yesterday

If cos(θ)=2853 with θin q iv, what is sin(θ)?