To represent the scenario where Kasey's mom pays Natalie $11 per hour plus a $6 tip, we first need to define the variables involved.
Let \( x \) be the number of hours of the pitching lesson. The total cost would then consist of the hourly rate multiplied by the number of hours, plus the tip.
The equation for the total cost can be set up as follows:
\[ 11x + 6 = 39 \]
Where:
- \( 11x \) represents the total payment for the hours worked (at $11 per hour),
- \( 6 \) is the tip,
- \( 39 \) is the total amount paid.
So, the correct equation to represent this scenario is:
\( 11x + 6 = 39 \).