the graph represents the heart rate of kelly as she exercises at the local ymca. she

exercises for 45 minutes in a cross fit class. use this graph to answer the questions below.

1. during which time period is kelly's heart rate increasing? (1 point)

2. using math, determine the exact rate of change for the increase (warm‐up). explain how

you got your answer. (3 points; 1 point for answering the question, 2 points for explaining

your answer)

3. during which time period did kelly's heart rate remain constant? (1 point)

4. using math, determine the exact rate of change for this time period. explain how you got

your answer. (3 points; 1 point for answering the question, 2 points for explaining your

answer)

5. during which time period did kelly's heart rate decrease? (1 point)

6. using math, determine the exact rate of change for the decrease (cool down). explain how

you got your answer. (3 points; 1 point for answering the question, 2 points for explaining

your answer)

7. explain why your rate of change for the cool down period was a negative value