Final answer:
The equation that represents the volume of water after t minutes of water being pumped out is V = 30 - 0.51t.
Step-by-step explanation:
The equation that could represent the volume of water in cubic meters after t minutes of water being pumped out is option B: V = 30 - 0.51t.
The equation represents a linear relationship between the volume of water (V) and time (t), where the volume decreases at a rate of 0.51 cubic meters per minute.
For example, if 10 minutes have passed, we can substitute t = 10 into the equation to find the volume: V = 30 - 0.51 × 10 = 30 - 5.1 = 24.9 cubic meters.