1. Lesson 1

1.11. Explore 7

Mathematics 30-2 Module 7

Module 7: Exponents and Logarithms

 

In Try This 3 you may have noticed that when exponential equations are in the form y = a(b)x, you can determine the y-intercept and whether the graph is increasing or decreasing. Knowing this information, you can match the graph based on these characteristics.



textbook

For another example of matching exponential equations and graphs, read “Example 3” on pages 343 to 345 of your textbook.

At the beginning of this lesson, the idea that the amount of caffeine in a person’s body decreases over time was introduced. The relationship between amounts of caffeine in a person’s body over time is an exponential function. In the next Self-Check you will look at a problem involving the exponential decrease of the amount of caffeine in a person’s body.

 

This is a photo of a cup of coffee with coffee beans beside it.

iStockphoto/Thinkstock

 



Self-Check 3


textbook

  1. Complete question 13 on page 349 of your textbook. Answer

  2. Complete question 14 on page 350 of your textbook. Answer

  3. Complete questions 18.a., 18.d., and 18.e. on page 350 of your textbook. Answer


textbook

Add the following terms to your copy of Glossary Terms:

  • exponential function
  • exponential growth
  • exponential decay

textbook

Add the following to your copy of Formula Sheet:

  • y = a(b)x