Answer:
You don't need to single out
to solve this question.
To solve:

So for the given interval 

(As confirmed by the attached graph)
Answer:
He didn’t have enough money for the groceries
Step-by-step explanation:
He started out with $10
He spent $3.49 on a gallon of milk
He spent $1.14 on 3 pounds of oranges each
He spent $3.46 on cereal
The total cost would be $10.37!