Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 15 hours of burning, a candle has a height of 13 centimeters. After 26 hours of burning, its height is 6.4 centimeters. What is the height of the candle after 18 hours? Candle height centimeters (in cm) Burning time (in hours)

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