Karissa measures the width of her book using the metric unit Centimeter(cm).
In this question,
The metric system of measurement is the standard system based on decimal values. The metric system is a system of measurement that uses the meter, litre, and gram as base units of length (distance), capacity (volume), and weight (mass) respectively.
To measure smaller or larger quantities, we use units derived from the metric units. It has unit conversions based on the powers of 10. Millimeter (mm), Decimeter (dm), Centimeter (cm), Meter (m), and Kilometer (km) are used to measure how long or wide or tall an object is.
In units of measurement of length or width we use centimeter (cm) to measure. We can use this unit for measuring the length of a box, the width of a book etc.
Hence we can conclude that Karissa measures the width of her book using the metric unit Centimeter(cm).
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