Noah had 6 magazines, and then $m$ more magazines arrived. We need to find the expression that represents the total number of magazines Noah has now.

1. Problem Description

Noah had 6 magazines, and then $m$ more magazines arrived. We need to find the expression that represents the total number of magazines Noah has now.

2. Solution Steps

The problem states that Noah initially had 6 magazines. Then, $m$ more magazines came. To find the total number of magazines, we need to add the initial number of magazines (6) to the number of magazines that came in the mail ($m$).

The expression is therefore $6 + m$.

3. Final Answer

$6 + m$