Identify Percent of Growth or Decay

The population of a certain town is modeled by f(x)=6191(1.04)^x . By what percent did the population increase by each year?

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

• Growth

• Decay

• Linear

• None

Is the following function and example of decay or growth? f(x)=2(0.85)^x

• Exponential Decay because 0.85 is between 0 and 1

• Exponential Growth because 0.85 is bigger than 1

The amount of money in your bank account per month, x, is modeled by the equation y=1,000(1.12)^x. What is the growth rate as a percent? HINT: b - 1 = ____ x 100 = ____%

• 88%

• 1.12%

• .0012%

• 12%

Given the function y=5(0.6)^x what is the decay rate as a percent? HINT: 1 - b = ____ x 100 = ____%

• .6%

• 60%

• 40%

• .4%

Consider the equation y=200(1.08)^x which models the increase in value of an autographed Annie program. Let y = the value of the item, let x = the number of years since the performance. What does the 1.08 in the equation indicate?

• The value of the item is increasing by $1.08 each year.

• The value of the item is increasing by 1.08% each year.

• The value of the item will increase to $200 1.08 years after purchase.

• The value of the item is increasing by 8% each year.

The population of Winnemucca, Nevada, can be modeled by P=6191(1.04)^t where t is the number of years since 1990. What percent did the population increase each year?

• 4%

• 104%

• .04%

• 400%

What is the growth factor of the situation represented by f(x)=10(0.3)^x?

• 10

• 0.3

• 1

• 3

In an exponential function, what does the 'b' represent?

• SLOPE

• RATE OF CHANGE

• Y-INTERCEPT/INITIAL VALUE

• GROWTH OR DECAY FACTOR

• Exponential Growth

• Exponential Decay