The amount of rainfall over one week is shown in the graph, where is the amount of rain, in centimeters, and is the day of the week. (The interval from 0 to 1 on the t-axis represents the 24-hour period for day 1, the interval from 1 to 2 represents the 24-hour period for day 2, and so on.) a. On what days did it rain? On what day(s) was the rain the heaviest? Explain.

b. On what days did it not rain? Explain.

c. Is it possible for the function to decrease? Explain.