Unit 6 Lessons 6-8 Assorted Practice

A computer costs $800. It loses 1/4 of its value every year after it is purchased.

Write an equation that models this situation.

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• (0, 4/5)

• (0, 100000)

• (4/5, 0)

• (100000 , 0)

• About 10 weeks

• About 4/5 weeks

• 100,000

• About 3 weeks

The two graphs show models of exponential decay representing the area covered by algae blooms in a lake, w weeks after different chemicals were applied.

Which algae bloom originally covered a larger area when the chemicals were applied?

• red

• blue

• They are both the same.

• There is not enough information to answer this question.

The two graphs show models of exponential decay representing the area covered by algae blooms in a lake, w weeks after different chemicals were applied.

Which algae bloom is decreasing more rapidly?

• red

• blue

• They are both the same.

• There is not enough information to answer this question.

A medicine is applied to a burn on a patient's arm. The area of the burn in square centimeters decreases exponentially and is shown in the graph.

What fraction of the burn area remains each week?

A medicine is applied to a burn on a patient's arm. The area of the burn in square centimeters decreases exponentially and is shown in the graph.

Write an equation representing the area of the burn a, after t weeks.

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A medicine is applied to a burn on a patient's arm. The area of the burn in square centimeters decreases exponentially and is shown in the graph.

What is the area of the burn after 7 weeks? Round to three decimal places.