A room cannot exceed the temperature of -20 degrees Fahrenheit, right now it is -72 degrees Fahrenheit. The temperature then starts to rise 6.3 degrees every hour. How many hours are there until the room temperature is surpassed?

We have 8.25 hours until the room temperature is surpassed.

Step-by-step explanation:

The initial temperature of the room is -72 F, and it rises 6.3 F every hour, which means after nth hour, the room temperature will be:

.

Therefore, the room temperature is surpassed when

we solve for

Thus, we have 8.25 hours until the room temperature is surpassed.

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step-by-step explanation: