The answer to this question is 224. This is an arithmetic series. The first term is with n = 1 into the summand which gives
2(1) + 1 = 3
The last term is with n = 14 into the summand which gives
2(14) + 1 = 29
There are a total of 14 - 1 + 1 = 14 terms in this arithmetic series.
The formula for sum of an arithmetic series is used to find the sum
S = n/2(first term + nth term) = 14/2(3+29) = 224
The answer to this question is 224.