To calculate the total points scored for 24 correct answers and 11 incorrect answers using the expression \( 15c - 10a \):
- Correct answers (c): 24
- Incorrect answers (a): 11
Now, plug in the values into the expression:
\[ 15c - 10a = 15(24) - 10(11) \]
Calculate each part:
\[ 15(24) = 360 \]
\[ 10(11) = 110 \]
Now substitute these values back into the expression:
\[ 360 - 110 = 250 \]
Therefore, the total points scored is 250.