Key Features of Exponential Functions Review

Consider the graph m(t).

True or False? The function is always increasing.

• True

• False

What is the domain of this function?

• (0, 100)

The value of some cell phones changes exponentially after initial release. Here are graphs showing the depreciation of two phones 1, 2, and 3 years after they were released.

Which phone is more expensive to buy when it is first released? How do you know?

• Phone A because its initial cost is $1,000

• Phone B because its initial cost is $840

• They both cost the same in the beginning, $0

• Not enough information on the graph to know.

Over what interval is f(x) positive?

• Never

Which of the following statements are true about the function below? Select all that apply.
f\left(x\right)=0.5\left(2\right)^x-1

• The function represents exponential growth

Which equation models the graph?

Which of the following statements are true of the exponential function? Select all that apply.

• The graph has been shifted up 3 units from the parent function.

• The function represents exponential growth.

Which function models the values in the table?

The population of deer in a certain town was 10,000 in 2015. Each year the population has decreased by 10%. That is, each year the population is 90% of what it was the previous year. Which equation models the population of deer since 2015?

Which statement describes the end behavior of the function above?