_ _ ,__-.___ _- _V, _...._._._ _..-.. .__,V.._. \"Tn".\"n 14! 13' 3E 11' 15. a _ (n+1)! 3! 7! 14. T (n+1)! 16' a\" = (271)! 4of5 Problems 17 - 20. write out each sum. Tl 20. (-1)\" 1n k Problems 21 - 24. write each sum using summation notation. 21, 1+3+5+7+,.+[2(15)1] 23, 13+23'+33+..+93 Problems 25 - 23. find the sum ofeach sequence, _1 1_1 _ a; 22. 1 2+4 a+..,+( 1) (23) 24, 0+3+iz+13+m e e 9 +1 e" 25, 3 26' so 23 2k k=1 k=1 27, 1\" 23. 2 20%\") Z(Sk+3) k=l k=1 Problems 29-30, salve. 29. Max bought a car by taking out a loan for $23,500 at 25% interest per month. His normal 5 payment is $417 per month, but he wants to pay an extra $100 tuward the balance each month. His balance each monthis mu 1 h r r i 1 fin n e 3,. = $23,500, 3,, = (1 + _Hl!i3"_1_ 517