Answer: D
Over the interval [4,7], the local minimum is -7
Answer:
4,200 liters
Step-by-step explanation:
The flow rate is given by:

Integrating the flow rate expression from t=0 to t=30 minutes, yields the total volume that flows out of the tank during that period:

4,200 liters of water flow from the tank during the first 30 minutes.
well, we can say that 1 hour is 100%, what is 2/5 hr off of it in percentage?

You havent added the options