The graph to the right shows the heart rate of a person watching a short romanti

Question

The graph to 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 3 through 15 minutes B. from 1 through 3 minutes and from 9 through 11 minutes C. from 1 through 11 minutes D. from 3 through 9 minutes and from 11 through 15 minutes (b) For which time periods was the person s heart rate decreasing?

Explanation / Answer

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Kindly note that any interval for which change is y is positive for positive change in x signifies the heart rate as increasing.

From the given interval we form the following subparts

A) From 1 to 3 , y is increasing

B) From 3 to 9, y is decreasing

C) From 9 to 11 , y is increasing

D) From 11 to 15, y is decreasing

Hence y is increasing in the interval 1 to 3 and 9 to 11

Option B is correct

Y is decreasing in the interval 3 to 9 and 11 to 15

Solution

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