Answer:
21=2x+4
x=$8.5
Explanation:
We know that the pay the student earns at an internship will add up to $21 and is therefor less. This means that the equation must be 21=2x+4 where x is the internship money. We solve for x to find how much the student makes at the internship.
21=2x+4
21-4=2x+4=4
17=2x
8.5=x