Step 1: Write out the expression
[tex]6m^2+7n[/tex]Step 2: Identify the terms
[tex]\text{the terms are }6m^2\text{ and +}7n[/tex]Step 3: Identify the constant.
A constant is a fixed number or a number on its own.
Since there is no fixed number in the given expression, then the constant is 0 (zero)
Step 4: Identify the variables
[tex]\text{The variables are }m\text{ and }n[/tex]