If X and Y are random variables with E(X) =7 and E(Y) = 3, then E(2X + 3Y) is: $\begin{array}{|l|l|}
\hline \text { D. } & 21 . \
\hline\text { A. } & 10 . \
\hline \text { B. } & 23 . \
\hline \text { C. } & 27 . \
\hline \text { D. } & 21 . \
\hline
\end{array}$

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The Answer of If X and Y are random variables with E(X) =7 and E(Y) = 3, then E(2X + 3Y) is: $\begin{array}{|l|l|}
\hline \text { D. } & 21 . \
\hline\text { A. } & 10 . \
\hline \text { B. } & 23 . \
\hline \text { C. } & 27 . \
\hline \text { D. } & 21 . \
\hline
\end{array}$

If X and Y Are Random Variables with E(X) =7