Exponential Growth and Decay in Fractions

A population of fish starts at 8,000 and decreases by 6% per year. What is the population of fish after 10 years?

• 14327

• 4309

• 839

• 7680

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

• y=5000(0.7)^x

• y=30(5000)^x

• y=5000(1.3)^x

• y=5000x^x

The number of mosquitoes at the beginning of the summer was 4,000. The population of mosquitoes is expected to grow at a rate of 25% a month. How many mosquitoes will there be after 4 months?

• 9766

• 9006

• 9765

• 5433

This is an example of....

• an exponential growth

• an exponential decay

• an increasing linear function

• none of the above

Is this exponential growth or decay?

• Growth

• Decay

What type of function is f(x)=2(1/7)^x ?

• Exponential Growth

• Linear

• Exponential Decay

• None of the Abovee

Is this graph an example of exponential growth or decay?

• growth

• decay

Is the pictured graph growth, decay, or linear or none?  

• Growth

• Decay

• Linear

• None

What function is present? 

• Absolute Value

• Exponential Decay

• Linear Equation

• Exponential Growth

Answer explanation

The function present is Exponential Decay because it represents a decreasing quantity over time.

Is this exponential growth or decay?

• Growth

• Decay