A candle manufacturer found that their long last candles melted according to the formula h = -2t + 12, where h is the height of

Question

A candle manufacturer found that their long last candles melted according to the formula h = -2t + 12, where h is the height of the candle, in cm, after t hours. How long will it take the candle to burn to a height of 7 cm?
1. 3
2. 2
3. 2.5

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