Is page one correct, it appear that I might be adding this wrong

a) What is the future value of 20 periodic payments of $5,000 each made at the beginning of each period and compounded at 8%? $247,114.58 $5,000 x 45.76196* = $228,809.80 $228,809.80 x (1 + 8%) = $247,114.58 *[(1 + 8%)^20 - 1] / 8% = 45.76196 (b) What is the present value of $2,500 to be received at the beginning of each of 30 periods, discounted at 10% compound interest? $25,924.01 $2,500 x 9.42691* = $23,567.28 $23,567.28 x 1.10= $25,924.008 *{1 - [1 / (1 + 10%)^30]} / 10% = 9.42691 (c) What is the future value of 15 deposits of $2,000 each made at the beginning of each period and compounded at 10%? (Future value as of the end of the fifteenth period.) $69,899.46 $2,000 x 31.77248* = $63,544.96 $63,544.96 x 1.10= $69,899.46 *[(1 + 10%)^15 - 1] / 8% = 31.77248 (d) What is the present value of six receipts of $3,000 each received at the beginning of each period, discounted at 9% compounded interest? $14,668.96 $3,000 x 4.48592 = $13,457.76 $13,457.76 x 1.09= $14,668.96 *{1 - [1 / (1 + 9%)^6]} / 9% = 4.48592 iod.)