Exponential Growth and Decay

Is this exponential growth or decay? How can you tell?

• Growth, because of 7

• Decay, because of 1.2

• Growth because of 1.2

• Decay because of 7

Pick the equation that is exponential growth

• y=2(0.5)^x
• y = 0.5(2)^x
• y = .5x - 2
• y = 2x + .5 

Pick the equation that is exponential decay

• y = 3(5)^x

• y = .5(5)^x

• y = 2(.5)^x

• y = 8(1)^x

Which graph represents exponential growth?

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Which graph represents exponential decay?

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• initial value: 2
  decay factor: 0.93

• initial value: 0.93
  decay factor: 2

• initial value: 2
  decay factor: 2.93

• initial value: 0.93
  decay factor: 2.93

Given the table above, what is the initial value?

• 175

• 70

• 28

• 0

Using the table above, determine the decay factor.

• 0.25

• 2.5

• 1

• 0.4

The equation y = 2000(1.28)^x is a model that predicts the amount of zebras in an area after a period of x years. Predict how many zebras are there after 3 years.

• 2000 zebras

• 3277 zebras

• 4194 zebras

• 7680 zebras

There are 9000 fish in a pound initially and 10440 fish in the pond after 1 year. Use the data to create an exponential equation that models the amount of fish in a pond after a period of x years.