February Holidays
Growth or Decay
Functions
Percent Rate
Word Problems
100
This holiday commemorates a 3rd-century Roman priest who secretly married couples to prevent husbands from going to war
What is Valentine's Day?
100
How do I know if the exponential relationship below is growth or decay?
y = 3(0.56)x
Decay has a b value or decay factor less than 1.
100
f(x)=3^x
What is f(4) ?
F(4) = 81
100
Is this exponential growth or decay?
What is the percent growth/decay rate?
y=5(0.5)^x
Exponential Decay
50%
100
2243
200
FDR, JFK
What is president's Day?
200
Do the following equations represent exponential growth, decay, or neither?
y=5x+6
Neither (It's linear! y=mx+b)
200
f(x)=(2/3)^x
f(3) = ?
8/27
200
Is this exponential growth or decay?
What is the percent growth/decay rate?
y=5(1.3)^x
Exponential Growth
30%
200
What will be the cost in 17 years?
$32,313.27
300
Happens only every 4 years, including this year.
What is Leap Year?
300
y=2(1.13)x
Does this function represent exponential growth or decay? What is the growth/decay RATE?
Exponential Growth
Rate: 0.13 or 13%
300
Does the graph represent exponential growth or decay?
What is Growth?
300
Is this exponential growth or decay?
What is the percent growth/decay rate?
y=1(0.01)^x
Exponential Decay
99%
300
16,941 people
400
6 more weeks of Winter?
What is Groundhog's Day?
400
y=5(0.97)x
Does this function represent exponential growth or decay? What is the growth/decay RATE?
Exponential Decay
Rate: 0.03 or 3%
400
function f(x) = 5^x
What coordinate point represents f(2)?
What is (2,25)
400
Is this exponential growth or decay?
What is the percent growth/decay rate?
y=1/2(0.7)^x
Exponential Decay
30%
400
Is the function exponential growth or decay?
Write the equation to represent the graph. 
Decay
y = 2400 (0.5x)
500
This celebration was launched by historian Carter G. Woodson in 1926 to coincide with the birthdays of Abraham Lincoln and Frederick Douglass.
What is Black History Month?
500
Ms. Wiggins purchased a car for 26,400 and every year it decays by 12%. What can she expect the value of her car to be after 3.5 years?
y=26400(.88)3.5=$16,876.92
500
Annual sales of a fast food restaurant are $530,000 and increasing at a rate of 5% per year. What will the annual sales be in 6 years? (show the equation and answer)
530,000(1.05)6 =$710,250.69
500
Is this exponential growth or decay?
What is the percent growth/decay rate?
y=1/2(1.07)^x
Exponential GROWTH
7%
500
If you put $500.00 into an account and the account earns a 3% yearly interest rate. How much will be in the account after 5 years?
Round the nearest cent!
$579.64