Exponential Growth and Decay (writing and evaluating exponential functions)
Exponential Functions have the form: y = a * b^x, y = a (b)^x.
Where a is the start/initial amount, b is the growth/decay factor, and x is the number of growths or decays.
For a percent increase, the growth rate is 1 + the increase.
Example: for a 25% increase, the growth rate is 1 + .25 = 1.25
For a percent decrease, the decay rate is 1 - the decrease.
Example: for a 25% decrease, the decay rate is 1 - .25 = 0.75
Exponential Functions are used when the function outputs are multiplied by the same amount.
This video could work for #Algebra students who were absent, or in a flipped classroom.
This PowerPoint is available to purchase: teacherspayteachers.com/Product/11605119 or
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0:00 Intro
1:28 Objectives
1:52 Ex1a Increase 1.9%
4:12 Ex1b Decrease 1.9%
5:17 Ex2 Doubles
6:27 Ex2a 4 hours
8:51 Ex2b 100 mins
9:01 Ex5 Pop decrease 4.5%
10:49 Wrap-Up