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?
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Solution
Initial temperature = 40∘C
Change in temperature per hour = −5∘C
Change in temperature after 10 hours = (−5)×10=−50∘C
Final temperature = 40∘C+(−50∘C)=−10∘C