Read the scenario. Sarah practices the piano for 30 minutes every day, increasing her total time by half an hour each day. How does this scenario show a constant rate of change between two quantities?

A constant rate of change means one quantity changes by the same amount for each equal step in another quantity. Sarah’s practice time increases by half an hour, or 30 minutes, each day. Therefore, the amount of time spent practicing increases by the same amount each day, which is choice C.

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