AnswersPre-Algebra - MA3119 A Distance LearningAdding and Subtracting DecimalsQuestion 3
3
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Adding and Subtracting Decimals

Question 3 • Pre-Algebra - MA3119 A ? Distance Learning

Alexandra is scuba diving. A diving computer automatically records her depth every five minutes. The depth readings from her first 20 minutes of diving are shown in the table below.Elapsed time (in minutes)Depth (in meters)005–12.4510–9.715–22.9820–6.6Which best represents the greatest amount of change in her depth over a single 5-minute period?

Answer
A
–16.38 meters
B
–13.28 meters
C
13.28 meters
D
16.38 meters

Explanation

Find the change in depth between each pair of readings five minutes apart, using the absolute value because the question asks for the greatest amount of change. The changes are 12.45, 2.75, 13.28, and 16.38 meters. The greatest is 16.38 meters, so the answer is D, 16.38 meters.

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