Write the sum $in$ expanded form.

${\displaystyle \underset{k=1}{\overset{5}{}}}\frac{1}{5k}{x}^{4k}$

$[\frac{-}{1}$ Points$]$

Write the sum $in$ expanded form.

${\displaystyle \underset{k=0}{\overset{4}{}}}\frac{2k-1}{2k+1}$

$[\frac{-}{1}$ Points$]$

SCALCET$6A.E\mathrm{.}006.$

Write the sum $in$ expanded form.

${\displaystyle \underset{k=5}{\overset{8}{}}}{x}^k$

Points