Identify Exponential Functions

“A bank account starts with $10. Every month, the amount of money in the account is tripled.” Write an equation to represent this situation

• y=3(10)^x

• y=10(3)^x

• y=10(1.3)^x

• y=3x+10

“There are 20,000 owls in the wild. Every decade, the number of owls is halved.” Can this be modeled with a linear or exponential equation?

• Linear

• Exponential

There are 20,000 owls in the wild. Every decade, the number of owls is halved. Write an equation to model this situation

• y=20000-(1/2)x

• y=20000+(1/2)x

• y=20000(0.5)^x

• y=20000(50)^x

A science experiment involves periodically measuring the number of mold cells present on a piece of bread. At the start of the experiment, there are 50 mold cells. Each time a periodic observation is made, the number of mold cells triples. For example, at observation #1, there are 150 mold cells.

• Linear

• Exponential

The population of a city is increasing by 2% each year. Is this an example of a linear or exponential function?

• linear

• exponential

Which of the below functions represents exponential growth?

What is the y-intercept of the function?

• none

• all real numbers

• (0, 80)

What is the range of the function?

• none of these

Determine which functions model exponential decay.

What is the y-intercept of the above exponential function?