Exponential Growth and Decay

What formula represents exponential DECAY?

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Kennedy won $3,000 from a radio contest. If she puts this money in a bank account that earns 2.9% interest compounded quarterly, how much total will she earn in 10 years?

• $4915.59

• $3933.28

• $2979.81

• $4005.09

A population of 2200 beetles is too large to sustain and decreases in population each month at a rate of 5%. How would you write your decay factor, b?

• -5

• -.05

• .95

• .05

What is the decay rate in the following model?
A=1200(.85)⁶

• -1200

• -.15

• 6

• -6

Is the table linear, exponential or neither?

• Linear

• Exponential

• Neither

What type of function best models the situation: A zombie virus has infected the population and the number of infected people triples every day.

• linear

• quadratic

• exponential growth

• exponential decay

Type of function:  You have a car whose initial value was $18,000.  Its value depreciates 4% each year.

• linear

• exponential

• quadratic

• neither

What type of function is f(x) = 3(¼)^x?

• exponential decay

• linear

• exponential growth

• quadratic

Identify the type of function.
y = 4^x + 3

• Exponential

• Linear

• Quadratic

• Cubic

Which of the following functions would display Exponential Decay?

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