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Name
Class
7-6
Date
Additional Problems
Exponential Functions
Problem 1
Does the table or rule represent an exponential function?
Explain.
a.
x
y
0
2
1
6
2
10
3
14
b. y 5 2x
Problem 2
Suppose a culture of bacteria doubles each hour. There are
initially 2200 bacteria. The function f (x) 5 2200 ? 2x gives the
number of bacteria after x hours. How many bacteria will there
be after 5 hours?
Prentice Hall Algebra 1 • Additional Problems
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
107
Name
7-6
Class
Date
Additional Problems (continued)
Exponential Functions
Problem 3
What is the graph of y 5 0.25 ? 3x ?
Problem 4
Suppose an investment of $7500 doubles in value every 12
years. The function f (x) 5 7500 ? 2x models the growth of the
investment, where x is the number of 12-year periods. Graph
the function.
Prentice Hall Algebra 1 • Additional Problems
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
108
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