we went through captial sigma one section in the first semester, where there is a big E looking thing called captial sigma, a limit at the top of it [#], a limit with an index at the bottom of it [x = #], and the summand on the right of the big E thing [f(x)]. to solve you plug the bottom limit into the summand that's on the right of the captil sigma and add it with the same formula but the next numberical number until you get to the limitation that is on the top of the big E thing.
For example:
4
E p+3
p=2
(2+3) + (3+3) + (4+3)
= 5 + 6 + 7
= 18
~~>for this you pluged the 2 into the formula p + 3, then added it with the same formula but with 3 instead of 2, then again with 4 instead of 3, after that you couldn't go any further because the limit at the top was 4. then you solve to get 18.
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