MATH 107 QUIZ 5
July, 2017
Instructor: S. Sands
NAME:
_______________________________
I have completed this assignment myself, working independently and not consulting anyone except the instructor.
INSTRUCTIONS
The quiz is worth 100 points, and there is an extra credit opportunity at the end. There are 10 problems. This quiz is
open book
and
open notes
. This means that you may refer to your textbook, notes, and online classroom materials, but
you must work
independently and may not consult anyone
(and confirm this with your submission). You may take as much time as you wish,
provided you turn in your quiz no later than
Sunday, July 9
.
Show work/explanation where indicated. Answers without any work may earn little, if any, credit.
You may type or write
your work in your copy of the quiz, or if you prefer, create a document containing your work. Scanned work is acceptable also.
In your document, be sure to include your name and the assertion of independence of work.
General quiz tips and instructions for submitting work are posted in the Quizzes module.
If you have any questions, please contact me by e-mail or phone (540-338-7120).
1. (4 pts) Which of these graphs represent a one-to-one function?
Answer(s): ____
A
________
(
no explanation required
.)
(There may be more than one graph that qualifies.)
(A)
(B)
(C)
(D)

2. (6 pts) The home-ownership rate is the percentage of households that are owner-occupied. Based on data of
U.S. home-ownership rates in the second half of the twentieth century, the following logarithmic model was
determined:
h
(
t
) = 397.68 ln(
t
)
2955.1,
where
t
= year and
h
(
t
) = home-ownership rate, in percent.
(Note that "ln" refers to the natural log function)
(explanation optional)
Using the model,
(a) What was the home-ownership rate in 1972, to the nearest tenth of a percent?