1. Concept

2. Graph y = 4x. State the domain and range.
Graph Exponential Growth Functions
Graph y = 4x. State the domain and range.
Make a table of values. Connect the points to sketch a smooth curve.
Example 1

3. Graph Exponential Growth Functions
Answer:
The domain is all real numbers, and the range is all positive real numbers.
Example 1

4. Which is the graph of y = 3x?
A. B.
C. D.
Example 1

5. Concept

6. A. Graph the function y = 3x – 2. State the domain and range.
Graph Transformations
A. Graph the function y = 3x – 2. State the domain and range.
The equation represents a translation of the graph y = 3x down 2 units.
Example 2A

7. Domain = {all real numbers} Range = {y│y > –2}
Graph Transformations
Answer:
Domain = {all real numbers}
Range = {y│y > –2}
Example 2A

8. B. Graph the function y = 2x – 1. State the domain and range.
Graph Transformations
B. Graph the function y = 2x – 1. State the domain and range.
The equation represents a translation of the graph y = 2x right 1 unit.
Example 2B

9. Domain = {all real numbers} Range = {y │y ≥ 0}
Graph Transformations
Answer:
Domain = {all real numbers}
Range = {y │y ≥ 0}
Example 2B

10. A. Graph the function y = 2x – 4.
A. B.
C. D.
Example 2A

11. B. Graph the function y = 4x – 2 + 3.
A. B.
C. D.
Example 2B

12. First, write an equation using a = 1.020 (in billions), and r = 0.195.
Graph Exponential Growth Functions
INTERNET In 2006, there were 1,020,000,000 people worldwide using the Internet. At that time, the number of users was growing by 19.5% annually. Draw a graph showing how the number of users would grow from 2006 to 2016 if that rate continued.
First, write an equation using a = (in billions), and r =
y = 1.020(1.195)t
Then graph the equation.
Example 3

13. Graph Exponential Growth Functions
Answer:
Example 3

14. CELLULAR PHONES In 2006, there were about 2,000,000,000 people worldwide using cellular phones. At that time, the number of users was growing by 11% annually. Which graph shows how the number of users would grow from 2006 to 2014 if that rate continued?
A. B.
C. D.
Example 3

15. Concept

16. A. Graph the function State the domain and range.
Graph Exponential Decay Functions
A. Graph the function State the domain and range.
Example 4A

17. Domain = {all real numbers} Range = {y│y > 0}
Graph Exponential Decay Functions
Answer:
Domain = {all real numbers}
Range = {y│y > 0}
Example 4A

18. B. Graph the function State the domain and range.
Graph Exponential Decay Functions
B. Graph the function State the domain and range.
The equation represents a transformation of the graph of
Examine each parameter.
● There is a negative sign in front of the function: The graph is reflected in the x-axis.
● a = 4: The graph is stretched vertically.
Example 4B

19. ● h = 1: The graph is translated 1 unit right.
Graph Exponential Decay Functions
● h = 1: The graph is translated 1 unit right.
● k = 2: The graph is translated 2 units up.
Answer:
Domain = {all real numbers}
Range = {y│y < 2}
Example 4B

20. A. Graph the function
A. B.
C. D.
Example 4A

21. B. Graph the function
A. B.
C. D.
Example 4B

22. Graph Exponential Decay Functions
A. AIR PRESSURE The pressure of the atmosphere is 14.7 lb/in2 at Earth’s surface. It decreases by about 20% for each mile of altitude up to about 50 miles. Draw a graph to represent atmospheric pressure for altitude from 0 to 20 miles.
y = a(1 – r)t
= 14.7(1 – 0.20)t
= 14.7(0.80)t
Example 5A

23. Graph the equation. Answer: Graph Exponential Decay Functions
Example 5A

24. y = 14.7(0.80)t Equation from part a.
Graph Exponential Decay Functions
B. AIR PRESSURE The pressure of the atmosphere is 14.7 lb/in2 at Earth’s surface. It decreases by about 20% for each mile of altitude up to about 50 miles. Estimate the atmospheric pressure at an altitude of 10 miles.
y = 14.7(0.80)t Equation from part a.
= 14.7(0.80)10 Replace t with 10.
≈ 1.58 lb/in2 Use a calculator.
Answer: The atmospheric pressure at an altitude of about 10 miles will be approximately lb/in2.
Example 5B

25. A. AIR PRESSURE The pressure of a car tire with a bent rim is 34
A. AIR PRESSURE The pressure of a car tire with a bent rim is 34.7 lb/in2 at the start of a road trip. It decreases by about 3% for each mile driven due to a leaky seal. Draw a graph to represent the air pressure for a trip from 0 to 40 miles.
A B.
C D.
Example 5A

26. B. AIR PRESSURE The pressure of a car tire with a bent rim is 34
B. AIR PRESSURE The pressure of a car tire with a bent rim is 34.7 lb/in2 at the start of a road trip. It decreases by about 3% for each mile driven due to a leaky seal. Estimate the air pressure of the tire after 20 miles.
A lb/in2
B lb/in2
C lb/in2
D lb/in2
Example 5B