Answer
$S_{30}=900$
Work Step by Step
The sequence consisting of the first 30 odd positive integers has $a_1=1$ and $d=2$. Using $S_n=\dfrac{n}{2}(2a_1+(n-1)d)$, then,
\begin{array}{l}
S_{30}=\dfrac{30}{2}(2\cdot1+(30-1)2)\\
S_{30}=15(2+58)\\
S_{30}=15(60)\\
S_{30}=900
.\end{array}
