February 21st, 2017, 05:48 PM  #1 
Newbie Joined: Oct 2016 From: Toronto Posts: 3 Thanks: 0  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? 
February 21st, 2017, 06:17 PM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,261 Thanks: 895 
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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