Please help me what is the increasing interval more than one answer

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?

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

If point a= (10,4) and b= (2,19) what is the length of ab 17 units 15 units 23 units 12 units