Exponential Functions: Growth and Decay

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$$f\left(x\right)=2\left(3\right)^x$$  

Which of these functions is a growth function? Check all that apply.

Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

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$$h\left(x\right)=12\left(\frac{1}{3}\right)^x$$  

Twenty years ago, Mr. Davis purchased his home for $160,000. Since then, the value of the home has increased about 5% per year. How much is the home worth today?

Suppose a culture of bacteria begins with 5000 cells and dies by 30% each year. Write an equation that represents this situation.

Moody's Print Shop purchased a new printer for $35,000. Each year it depreciates at a rate of 5%. How much will the printer be worth in 8 years?