Answer:
Choice B
Step-by-step explanation:
He is currently 40 inches in height.
He needs to be 48 inches in height to ride the roller coaster.
He is growing 1.2 inches per month (m)
So, 40 + 1.2m ≥ 48
40 inches + average gain per month has to be greater or equal to (≥) 48 inches.
