## Precalculus (6th Edition) Blitzer

$\sum_{k=2}^{15} 2k+1$ (Other answers are possible.)
In order to set up the summation notation, we must calculate that value which keeps constantly changing. That value will be designated as the $i$ term. The remaining terms would remain constant in the summation notation. Thus, we get the summation notation: $5+7+9+......+31=\sum_{k=2}^{15} 2k+1$