9. An equation representing the height of a burning candle is H = 2(9-21), where H is the height of the candle in cm and
t is the amount of time that the candle has been burning in minutes,
How long will it take for the candle to burn down to a height of 4 cm?
a. 2 min
b. 3.5 min
c. 5.5 min
d. 7 min

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