Question

Find the sum that is given by

Answer 1

...by what?

Answer 2

\[\sum_{k=1}^{5} 3k-1\]

Answer 3

The sum is 40.

Answer 4

I plugged it into the Calculator thank you for your help! :)

Answer 5

The summation you put up basically says: for 5 multiples of 3, subtract 1 from each then add up all of it. So fro that, we get 3 + 6 + 9 + 12 + 15 from sigma 3k. But we need sigma 3k less 1, so we do 2 + 5 + 8 + 11 + 14 which happens to equate to 40.

Answer 6

You're welcome