To find the midpoint \( M \) of the line segment \( EF \) with endpoints \( E \) and \( F \), you can use the midpoint formula:
\[ M = \frac{E + F}{2} \]
Substituting the values of \( E \) and \( F \):
\[ M = \frac{-17 + 5}{2} \]
Now, calculate the sum:
\[ -17 + 5 = -12 \]
Then divide by 2:
\[ M = \frac{-12}{2} = -6 \]
Therefore, the midpoint \( M \) of \( EF \) is \( -6 \).