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Answer:

Kate has changed the unit of measurement from centimeters to decimeters.

Step-by-step explanation:

Tony measures a drum stick and the length is measured to be 31 centimeters.

Now, Kate converts Tony's measurements and gets 3.1.

Now, we know that 10 centimeters are equivalent to 1 decimeter.

Hence, 1 centimeter will be equivalent to 0.1 decimeters.

And, 31 centimeters will be equivalent to 31 × 0.1 = 3.1 decimeters.

So, Kate has changed the unit of measurement from centimeters to decimeters. (Answer)

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