The graph in the figure below shows the mean flow F for the Arkansas River, in cubic feet of water per second, as a function of the time t, in months, since the start of the year. The flow is measured near the river's headwaters in the Rocky Mountains. (a) Use functional notation to express the flow at the end of October. F 10 Correct: Your answer is correct. Estimate the value of the above term. 500 Correct: Your answer is correct. ft3 sec (b) When is the flow at its greatest? April May June July August October Correct: Your answer is correct. (c) At what time is the flow increasing the fastest? April May June July August October Correct: Your answer is correct. (d) Estimate the average rate of change per month in the flow during the first 2 months of the year. 400 Incorrect: Your answer is incorrect. ft3/sec per month