Answer:  

Explanation:
 You need to analize the information given in the exercise.
 For this exercise you can use the following formula:
 

 In this case, according to the information given in the exercise, Max spends a total amount of $2.25 on gas for his lawn mower, but he earns $13.00 mowing his neighbor's yard; so you can identify that:
 

 Therefore, knowing these values, you can subsitute them into the formula given above:
 

 And finally you need to evaluate in order to calculate Max's profit. You get the following result:
 
