$($a$){\displaystyle \underset{n=1}{\overset{}{}}}\frac{1}{2n+5}$

$($b$){\displaystyle \underset{n=1}{\overset{}{}}}\frac{1}{n^{}}$

$($c$){\displaystyle \underset{n=2}{\overset{}{}}}\frac{1}{(2n+7{)}^3}$

$($d$){\displaystyle \underset{n=1}{\overset{}{}}}\frac{n^2}{n^3+1}$

Dertermine if the series is convergent or divergent using the Integral Test.