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February 21st, 2017, 05:48 PM   #1
Joined: Oct 2016
From: Toronto

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How do I find the area?

Area = summation from 3 to n=1 of f(s) * delta X
=Summation from 3 to n=1 of 15+7sin(Pi*s/12) * 3

How do I solve this problem?
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February 21st, 2017, 06:17 PM   #2
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You are summing over n but there is no n in the function to be summed???
Do you mean $\displaystyle \sum_{n=1}^3 15+ 7 sin\left(\frac{\pi n}{12}\right)*3$ or is it $\displaystyle \sum_{n=1}^3 (15+ 7sin\left(\frac{\pi n}{12}\right)(3)$?

The second fits better with your with and .

If it is the second, write out the three terms, with n= 1, 2, and 3, and add:

Last edited by Country Boy; February 21st, 2017 at 06:27 PM.
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