The longest side of a triangle is six more units than the shorter side. the third side is twice the length of the shortest side. if the perimeter is 25 units write and solve an equation to find the lengths of all three sides of the triangle

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?