Final answer:
The amount of water in the container (T) in terms of minutes (m) is represented by the expression T = 150 + 6m.
Step-by-step explanation:
The mathematical expression that represents the amount of water (T) in the container (m) minutes later, given that the container initially has 150 liters of water and is filled at a constant rate of 6 liters per minute, is T = 150 + 6m. This expression takes into account the initial amount of water (150 liters) and adds the additional water that is filled into the container at a rate of 6 liters per minute (6m).