To solve the expression \( 9(7 \frac{1}{2}) + 3(7 \frac{1}{2}) \), we can start by converting the mixed number \( 7 \frac{1}{2} \) into an improper fraction.
\[ 7 \frac{1}{2} = 7 + \frac{1}{2} = \frac{14}{2} + \frac{1}{2} = \frac{15}{2} \]
Now substitute \( \frac{15}{2} \) back into the expression:
\[ 9(7 \frac{1}{2}) + 3(7 \frac{1}{2}) = 9\left(\frac{15}{2}\right) + 3\left(\frac{15}{2}\right) \]
Factor out \( \frac{15}{2} \):
\[ = \left(9 + 3\right)\left(\frac{15}{2}\right) = 12\left(\frac{15}{2}\right) \]
Now multiply:
\[ = \frac{12 \times 15}{2} = \frac{180}{2} = 90 \]
Therefore, the answer is:
\[ 90 \]
It seems there may have been a misunderstanding with the original choices provided, as none listed are equal to 90. Please verify the options again, or if there's something specific you need, let me know!