Posted by Neil on Tuesday, May 29, 2012 at 8:40pm.
20
(Sigma Sign) 2n + 7
k= 1

Math  MathMate, Tuesday, May 29, 2012 at 8:51pm
∑2n+7
=2∑n + ∑ 7
=2*(20+1)(20/2) + 20*7
=420+140
=560

Math  Neil, Tuesday, May 29, 2012 at 8:53pm
Thank you, MathMate.

Math  Neil, Tuesday, May 29, 2012 at 8:59pm
Wait, do you know how it could be plugged into the Sn= a1 (1  r^n/ 1  r) formula?

Math  MathMate, Tuesday, May 29, 2012 at 10:22pm
Sn= a1 (1  r^n/ 1  r)
applies when the series is a geometric progression, such as
20
∑ a1*r^i
i=1
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