Question

Please let me know if I did them right. I am getting ready for my final. Thank you! I did them on a calculator.
Compute:
(a)
\[\sum_{i=1}^{5}2^{i}\]
i got 62
(b)
\[\sum_{k=3}^{12}(-1)^{k}k/k ^{2}+1\]
i got -.1299
(c)
\[\sum_{i=1}^{5}i!\]
I got 153

Answer 1

a and c are quite right

Answer 2

ok thank you. do you know about b?

Answer 3

let me check it

Answer 4

ok thank you!

Answer 5

Quite Right

Answer 6

http://www.wolframalpha.com/input/?i=sigma+%28k+%3D+3+to+12%29+of+%28%28%28-1%29%5Ek%29*k%29%2F%281%2Bk%5E2%29

Answer 7

thank you for your help!