A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour. What will be the room temperature 10 hours after the process begins?
Initial temperature = 40°C
Change in temperature per hour = −5°C
Change in temperature after 10 hours = (−5) × 10 = −50°C
Final temperature = 40ºC + (−50ºC) = −10°C