Elisas hair was 12 inches long after her last haircut. Since then it has grown 1/2 inch each month . Elisas hair is now 15 inches long. How many months has it been since her last haircut?
Which equation models this situation?
A. 1/2x + 15=12
B. 12-1/2x=15
C. 1/2x+12=15
D. 2x+12=15