Question
The graph 10 the right shows the heart rate of a person watching a short romantic film where x represents time in minutes, and y represents heart rate In beats per minute. Answer the following questions. (a) For which time periods was the person's heart rate increasing? A. from 1 through 11 minutes B. from 4 through 8 minutes and from 11 through 15 minutes C. from 4 through 15 minutes D from 1 through 4 minutes and from 8 through 11 minutes (b) For which time periods was the person's heart rate decreasing? A. from 4 through 15 minutes B. from 4 through 8 minutes and from 11 through 15 minutes C. from 1 through 11 minutes D from 1 through 4 minutes and from 8 through 11 minutes (c) How many turning points (from increasing to decreasing or from decreasing to increasing) occurred for the person's heart rate during the 15 mini _ (d) Suppose that a polynomial function is used to model the data displayed by the graph What is the degree of the polynomial function of best fit? (of turning points to determine the degree.) For the model in part (d), should the leading coefficient of the polynomial function be positive or negative? Why? A negative because the graph rises to the left and falls to the right B. positive because the graph falls to the left and rises to the right C. positive because the graph falls to the left and falls to the right D. negative because the graph falls to the left and falls to the right (f) Use the graph to estimate the person's maximum heart rate during the 15 minute film. _ bpm After how many minutes did this maximum heart rate occur? _ minute(8) (g) Use the graph to estimate the persons minimum heart rate during the 15 minute film. _ bpm After how many minutes did this minimum heart rate occur? _ minute(s)
Explanation / Answer
a) from 1 to 4 and from 8 to 11 minutes
b) 4 to 8 and from 11 to 15 minutes
C) Turing points:
Increase to decrease 10 points(4,5,6,7,8,11,12,13,14&15)
Decrease to increase 8 points (1,2,3,4,8,9,10&11)
F) maximum heart beat 75
after 4min
g) minimum heart beat
65After 8min
