## anonymous 5 years ago Write the series in summation notation, using the symbol ∑ and appropriate indices, Do NOT find the indicated sum. 9+13+17+21+25 (I need to find the top and bottom number of ∑)

1. anonymous

first term = 9 difference = +4 Tn = a +(n-1)d = 9 +4(n-1) = 4n +5 so its the sum of (4n+5) from n=1 to 5

2. anonymous

$\sum_{n=1}^{5} ( 4n+5)$

3. anonymous

wow u guys are incredible... thank you...!!!