1. If the number of people in a city doubles every 20 years,
1. determine the number of people in the city at the end of 50 years if the current population is 10,000 people.
   
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2. determine how long it will take the city to exceed its ability to provide services if the maximum population that it can serve is 500,000 people.
   
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2. A body in a room at 50 degrees cools from 100 degrees to 90 degrees in 30 minutes. Find the time it would take for the body to cool to 60 degrees. The body loses heat at a rate proportional to the difference in temperature between the body and the room.
   
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