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Elementary and Intermediate Algebra
Mark Dugopolski, Southeastern Louisiana University
Exponential and Logarithmic Functions
Exponential Functions and Their Applications

Warm-Ups



1

If f (x) = 4x, then f (-1/2) = -2.
A)TRUE
B)FALSE
2

If f (x) = (1/3)x, then f (-1) = 3.
A)TRUE
B)FALSE
3

The function f (x) = x4 is an exponential function.
A)TRUE
B)FALSE
4

The functions f (x) = (1/2)x and g(x) = 2-x have the same graph.
A)TRUE
B)FALSE
5

The function f (x) = 2x is invertible.
A)TRUE
B)FALSE
6

The graph of y = (1/3)x has an x-intercept.
A)TRUE
B)FALSE
7

The y-intercept for f (x) = ex is (0, 1).
A)TRUE
B)FALSE
8

The expression 221/2 is undefined.
A)TRUE
B)FALSE
9

The functions f (x) = 2-x and g(x) = 1/(2x) have the same graph.
A)TRUE
B)FALSE
10

If $500 earns 6% compounded monthly, then at the end of 3 years the investment is worth 500(1.005)3 dollars.
A)TRUE
B)FALSE








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