AP PRECALCULUS Test Booklet AP Classroom homework on 1.2 Interval 4 -1.5 , the function has a negative rate of change. (D) For any interval of a -1.5 , the function has a positive rate of change.25- 20 Temperature 15 10 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan First Day of Month The daily high temperature at a certain point in a river is modeled by the graph. Each point on a vertical gridline indicates the temperature, in degrees Celsius, on the first day of the indicated month. Of the following, on the first day of which month is the rate of change of the temperature the greatest? (A) February (B) May (C) August (D) November 5. The function f has a negative average rate of change on every interval of a in the interval 0