Algebra 1 | Unit 5 | Lesson 5: Representing Exponential Decay | Practice Problems

The graph shows the amount of a chemical in a water sample at different times after it was first measured. Select all statements that are true.

• The amount of the chemical in the water sample is decreasing exponentially.

• The amount of the chemical in the water sample is not decreasing exponentially.

• It is not possible to tell for certain whether or not the amount of the chemical is decreasing exponentially.

• When it was first measured, there were 2,000 mg of the chemical in the water sample.

• After 4 hours, there were 100 mg of the chemical in the water.

The graph shows the amount of a chemical in a patient's body at different times measured in hours since the levels were first checked. Could the amount of this chemical in the patient be decaying exponentially? Explain how you know.

The height of a plant in mm is 7. It doubles each week. Select all expressions that represent the height of the plant, in mm, after 4 weeks.