Asked by benji

find the sum of the following arithmetic series and write in summation notation
a. 4, 11, ... to 16 terms
b. 19, 13, ... to 10 terms
thank you so much!
Answered by Damon
a. a = 4 and d = 7
b, a = 19 and d = -6
https://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
Answered by oobleck
#1.

15
∑ 4+7k
k=0
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