Can anyone plz solve this one for me? ? this is the 3rd question.

21=2x+4

x=$8.5

Step-by-step 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

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)