Question

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 ∑)

Answer 1

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

Answer 2

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

Answer 3

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