SOLUTION: What is the value of the expression: 3(n upper) sigma 1(i lower bound) (3i+1) Please help I do not understand this!

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Question 477550: What is the value of the expression: 3(n upper) sigma 1(i lower bound) (3i+1)
Please help I do not understand this!
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

In response to your reply: sum((3i+1), i=1, 3 ) would be a way of writing it

If I am understanding your question properly:

sum%28%283i%2B1%29%2C+i=1%2C+3+%29 = (3*1+1) + (3*2+1)+(3*3+1) = 4 + 7 + 10 = 21