The width of a desk is 25 inches, or 63.5 centimeters. If a measurement in inches varies directly with a measurement in centimeters, what is the length, in centimeters, of a notebook that is 11 inches long? Round your answer to the nearest hundredth, if necessary.

Since inches and centimeters vary directly, use the desk measurement to find the conversion rate: 63.5 ÷ 25 = 2.54 centimeters per inch. For an 11-inch notebook, 11 × 2.54 = 27.94 centimeters. The notebook is 27.94 centimeters long, which is choice C.

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