Find the value of 13-m when m=9

To find the value of \( 13 - m \) when \( m = 9 \), substitute \( 9 \) for \( m \):

\[ 13 - m = 13 - 9 \]

Now, perform the subtraction:

\[ 13 - 9 = 4 \]

So, the value of \( 13 - m \) when \( m = 9 \) is \( 4 \).