Question

2. Write the compound sentence. How do you know?

"The thermometer and the cough syrup are in the medicine cabinet next to the cotton balls."

Answer 1

This isn't a compound sentence

it does not have a conjuction, colon or semicolon joining two independent clauses.

A compound sentence would be this:

The thermometer and the cough syrup are in the medicine cabinet; they are next to the cotton balls.