Answer
$\sum_{i=1}^{15}(\frac{5}{1+i})$ or $5\cdot\sum_{i=1}^{15}(\frac{1}{1+i})$
Work Step by Step
We can see that the number in the denominator, the second part of the addition is changing from 1 to 15 with steps of 1. Therefore this will be our variable, and the first part of the addition in the denominator and the nominator are not changing.
We can write that the sum is:
$\sum_{i=1}^{15}(\frac{5}{1+i})=5\cdot\sum_{i=1}^{15}\frac{1}{1+i}$
