Read the scenario. A cell phone battery drains from 100 percent to 0 percent over 4 hours while playing videos continuously. Is one quantity changing at a constant rate relative to another in this scenario?

A constant rate would mean the battery loses the same percentage during each hour. Knowing it goes from 100% to 0% in 4 hours gives only the overall change, not whether the drain is steady throughout. Battery drain can vary based on usage, so the information does not establish a constant rate; that is why “No, because the battery drain can vary based on usage” is correct.

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