00:01
In this problem, we're being asked to evaluate the given series.
00:04
Well, we have our series written in summation notation.
00:07
So in this case, we're trying to find the sum of the first seven terms, because we're going from i equals 1 to i equals 7.
00:13
And the formula to find any term in the sequence is given by 2i plus 1.
00:18
So first, let's write out our terms.
00:20
So the first term would be 2 times 1 plus 1.
00:25
The second term, we substitute in 2, so 2 times 2 plus 1.
00:29
The third term, we substitute in three, two times three plus one.
00:34
For the fourth term, we substitute in four, two times four plus one.
00:39
For the fifth term, we substitute in five, so two times five plus one...