SOLUTION: the height of a 9 inch candle changes at a rate of -2/3 inches per hour when it is burning how long will it take the candle to burn completely
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Question 1123453: the height of a 9 inch candle changes at a rate of -2/3 inches per hour when it is burning how long will it take the candle to burn completely
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
The length of the candle in inches after "h" hours is 9-(2/3)h.
The candle is burned completely when its length is 0.
So solve the equation: .
Of course, you don't need to use formal algebra. Just find how many "2/3 of an inch" there are in 9 inches.
It might sound complicated because of the fraction. But it's the same kind of calculation as if the candle were 14 inches long and burning at a rate of 2 inches per hour: (14 inches) divided by (2 inches per hour) = 7 hours.
(9 inches) divided by (2/3 inch per hour) = ?? hours.
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