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height of the candle after 12 hours

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The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of -0.5. See the figure below.

Suppose that the height of the candle after 18 hours is 19 centimeters. What was the height of the candle after 12 hours?

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This solution finds the height of the candle after 12 hours.

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If we take the height of the candle as h, then it is a function of time t, it has been burning so we have height=h(t).
Now since h(t) is a linear function of time or t, we have ...

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