In (x-h)^2+(y-k)^2=r^2 and if the center is (3,-5), does k becomes positive? or does it stay negative?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

If 1/2+2/5s=s-3/4,what is the value of s? a. s=3/4 b. s=25/12 c. s=-25/12 d. s=-3/4

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?