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.

(b) for which time periods was the persons heart rate decreasing?

a. from 3 through 15 minutes
b. from 1 through 3 minutes and from 9 through 11 minutes
c. from 3 through 9 minutes and from 11 through 15 minutes
d. from 1 through 11 minutes

Explanation:

Identify the intervals of decrease

Using the Graph Interpretation and Increasing Intervals knowledge points

• The graph goes down from \(x = 3\) to \(x = 9\).
• The graph goes down from \(x = 11\) to \(x = 15\).

Match with the options

Using the Graph Interpretation knowledge point

• Option C matches these intervals: "from 3 through 9 minutes and from 11 through 15 minutes".

Answer:

• A. from 3 through 15 minutes
• B. from 1 through 3 minutes and from 9 through 11 minutes
• C. from 3 through 9 minutes and from 11 through 15 minutes (Correct answer)
• D. from 1 through 11 minutes