Posted by **Adam** on Saturday, February 5, 2011 at 6:02am.

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 11 hours of burning, a candle has a height of 18.6 centimeters. After 27 hours of burning, its height is 12.2 centimeters. What is the height of the candle after 15 hours?

- Math -
**drwls**, Saturday, February 5, 2011 at 6:18am
Calculate how much height it loses per hour. Call it m.

m = (18.6 - 12.2)/16 = ___ cm/h

Then solve

(candle height) y = 12.2

= 18.6 - m(t - 11)

using t = 15

It's called interpolation.

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**Adam**, Saturday, February 5, 2011 at 6:30am
thanks for the help

- Math -
**Anonymous**, Sunday, January 13, 2013 at 10:19pm
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 10 hours of burning, a candle has a height of 24 centimeters. After 27 hours of burning, its height is 20.6 centimeters. What is the height of the candle after 21 hours?

- Math -
**Anonymous**, Monday, March 18, 2013 at 11:18am
i don't know the answer at all tall my now

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