Final answer:
The appropriate intervention for an adolescent with diabetes mellitus who has low blood glucose levels is to administer a sugary snack or juice.
Step-by-step explanation:
Hypoglycemia, or low blood glucose, is a common complication in individuals with diabetes mellitus. Symptoms of hypoglycemia include flushing, hunger, and dizziness. When a blood glucose level of 60 mg/dL is measured, it indicates hypoglycemia. The appropriate intervention in this case would be to administer a sugary snack or juice to quickly raise the blood glucose levels and alleviate the symptoms. This will provide the body with a source of glucose to restore blood sugar levels to normal.