(Mathletes) Identifying Independent and Dependent Variables

Henry is cooking a turkey for his family. His recipe says to cook the turkey for 15 minutes per pound.

What is the independent variable?

• time (minutes)

• weight (ounces)

• time (hours)

• weight (pounds)

Henry is cooking a turkey for his family. His recipe says to cook the turkey for 15 minutes per pound.

What is the dependent variable?

• time (minutes)

• weight (ounces)

• time (hours)

• weight (pounds)

When Jane exercises on an elliptical machine, her initial heart rate is 90 beats per minute. She warms up at this rate for 5 minutes. Over the next 5 minutes, she gradually increases to 150 beats per minute. She maintains that rate for 15 minutes before gradually decreasing back to her original heart rate at the end of her 30-minute workout.

What is the independent variable?

• heart rate (beats)

• time (hours)

• time (minutes)

• 150 beats

When Jane exercises on an elliptical machine, her initial heart rate is 90 beats per minute. She warms up at this rate for 5 minutes. Over the next 5 minutes, she gradually increases to 150 beats per minute. She maintains that rate for 15 minutes before gradually decreasing back to her original heart rate at the end of her 30-minute workout.

What is the dependent variable?

• heart rate (beats)

• time (hours)

• time (minutes)

• 150 beats

Henry is cooking a turkey for his family. His recipe says to cook the turkey for 15 minutes per pound.

Determine which graph models the scenario.

• Graph A

• Graph B

When Jane exercises on an elliptical machine, her initial heart rate is 90 beats per minute. She warms up at this rate for 5 minutes. Over the next 5 minutes, she gradually increases to 150 beats per minute. She maintains that rate for 15 minutes before gradually decreasing back to her original heart rate at the end of her 30-minute workout.

Determine which graph models the scenario.

• Graph A

• Graph B

• Graph C

The Elkwood Aquatic Society is working with various reptile species to increase their populations. The initial population of 450 endangered turtles tripled each year for the past five years.

What is the independent variable?

• time (years)

• number of turtles

• time (hours)

• Elkwood Aquatic Society

The Elkwood Aquatic Society is working with various reptile species to increase their populations. The initial population of 450 endangered turtles tripled each year for the past five years.

What is the dependent variable?

• time (years)

• number of turtles

• time (hours)

• Elkwood Aquatic Society

The Elkwood Aquatic Society is working with various reptile species to increase their populations. The initial population of 450 endangered turtles tripled each year for the past five years.

Determine which graph models the scenario.

• Graph D

• Graph E

• Graph F

A freshly made cup of tea is served at a temperature of about 180°F. The tea cools rapidly at first, and then slows down gradually as it approaches room temperature.

What is the independent variable?

• tea

• independent

• temperature (degrees F)

• time (minutes)