## Calculus 8th Edition

$63.5$ or $\frac{127}{2}$
We expand and simplify the sum: $\displaystyle \sum_{i=-2}^{4}2^{3-i}$ $=2^{5}+2^{4}+2^{3}+2^{2}+2^{1}+2^{0}+2^{-1}$ $=32+16+8+4+2+1+0.5$ $=63.5$ or $\frac{127}{2}$