Posted by Adam on .
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,
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. 
Math 
Adam,
thanks for the help

Math 
Anonymous,
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,
i don't know the answer at all tall my now