Problem:
Find the dot product of the following two vectors:
$\left(
\begin{array}{c}
 -6 \sqrt{3} \\
 -5 \sqrt{3} \\
\end{array}
\right)$ and
$\left(
\begin{array}{c}
 3 \sqrt{3} \\
 -5 \sqrt{3} \\
\end{array}
\right)$.
Answer:
$21$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/dot_product/41034.txt'}