The number of bacteria in a laboratory quadruples every hour. There were initially 200 bacteria. Write an expression for , the number of bacteria hours after the initial measurement.
The value of a car depreciates by per year. A new car costs . Write an expression for the car’s value in dollars when it is years old.
Property rental prices downtown are increasing at a rate of per year. This year, an apartment is available for $800 a month. Write an expression for , the value in dollars of the apartment years from now.