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MATH 107 QUIZ 3
NAME: _______________________________
April, 2019
Instructor: S. Sands
I have completed this assignment myself, working independently and not consulting anyone except the instructor.
INSTRUCTIONS
• The quiz is worth 100 points. There are 9 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, April 14.
• 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.
1. (6 pts) For each graph, is the graph symmetric with respect to the x-axis? y-axis? origin?
(No explanation required. Just answer Yes or No to each question.)
(a)
(b)
Symmetric with respect to the
Symmetric with respect to the
x-axis? ____
x-axis? ____
y-axis? ____
y-axis? ____
origin? ____
2. (6 pts) Let 𝑓(𝑥) = 2|𝑥| − 3.
origin? ____
(no explanation required)
(a) State the zero(s) of the function. ________
(b) Which of the following is true? 2. ______
A. f is an even function.
B. f is an odd function.
C. f is both even and odd.
D. f is neither even nor odd.
3. (6 pts) Which of the following equations does the graph represent? Show work or explanation.
3. ______
A.
1
𝑦=− 𝑥+ 6
3
B.
1
𝑦= 𝑥+ 6
3
C.
𝑦 = −3𝑥 + 6
D.
𝑦 = 3𝑥 + 6
4. (12 pts) Consider the points (–3, 1) and (6, 4).
(a) Find the slope-intercept equation of the line passing through the two given points. Show work.
(b) Graph the line you found in (a), either drawing it on the grid in the previous problem #3, or generating the
graph electronically and attaching it.
(c) Compare your line for this problem, #4, with the line in the previous problem #3. Are the two lines parallel,
perpendicular, or neither parallel nor perpendicular? (The terms parallel and perpendicular are discussed on pages 166
and 167.) No explanation required – just state the answer.
5. (10 pts) A ball is thrown vertically upward with an initial velocity of 40 feet per second from the top of the
180-foot high tower of Pisa. The height h in feet at t seconds after the ball’s release is given by
h(t) = –16t2 + 40t + 180 feet for 0  t  4.5 seconds.
(a) What was the height of the ball 2 seconds after the ball’s release?
(b) What was the height of the ball 4 seconds after the ball’s release?
(c) Find and interpret (in a sentence) the average rate of change of h over the interval [2, 4]. Show work.
3. (16 pts) Lana wants to purchase custom-made bumper stickers to advertise her business. Two
websites offer different deals:
Website A: Pay a fixed design fee of $65.00, plus $0.30 per bumper sticker
or
Website B: Pay a fixed design fee of $36.50, plus $0.45 per bumper sticker
(a) State a linear function f (x) that is Website A’s total charge A for an order of x bumper stickers.
(b) State a linear function g(x) that is Website B’s total charge B for an order of x bumper stickers.
(c) Lana wants to purchase 240 custom-made bumper stickers, as cheaply as possible. At which website
should she place her order? Show work/explanation and state your answer.
(d) For what number of bumper stickers x is the total charge exactly the same for both websites? Write
an appropriate equation, show algebraic work to solve for the answer, and state the final result
carefully.
(e) (work not required to be shown for this part) Suppose we want to find out: For what number of
bumper stickers is Website A the better choice for Lana rather than Website B?
Which inequality should be solved? Choose (i) f (x) < g(x) or (ii) f (x) > g(x).
Choice: __________
Fill in the blanks:
Website A is the better choice for Lana if ____(choose less or more) than ______ (enter number) bumper
stickers are ordered.
7. (7 pts) A graph of y = f (x) follows. No formula for f is given.
Which graph (A, B, C, or D) represents the graph y = f (x + 1) − 2 ?
EXPLAIN YOUR CHOICE.
(Grid supplied for scratch work; You are NOT required to submit your own graph)
y = f(x) 4
4
2
2
-4
2
-2
4
-4
-4
-2
-2
-2
-4
-4
A. (below)
2
4
2
4
2
4
B. (below)
4
4
2
2
2
-2
4
-4
-2
-2
-2
-4
-4
C. (below)
-4
7. _______
D. (below)
4
4
2
2
2
-2
4
-4
-2
-2
-2
-4
-4
8. (20 pts, no explanation required) Consider the graph of the function y = f (x) pictured below.
(a) State the value of f (−2).
(b) State the x-intercept(s), if any.
(c) State the y-intercept(s), if any.
(d) State the domain of the function.
(e) State the range of the function.
(f) State the interval(s) on which the function is increasing. That is, for what x-values is the
function increasing?
(g) State the interval(s) on which the function is decreasing. That is, for what x-values is the
function decreasing?
9. (17 pts) Based on historical data retrieved from the
government agency NOAA, the following chart of
Washington, DC yearly average temperatures was prepared.
Average Temperature (degrees)
y = 0.0344x – 10.107
R² = 0.6242
Washington DC Avg Temp
62
60
58
56
54
52
50
1860
1880
1900
1920
1940
1960
1980
2000
2020
Year
For this data set, the line of best fit, the regression line, is y = 0.0344x – 10.107,
where x = year and y = average Washington, DC temperature, in degrees. The value of r2 is 0.6242.
(a) Use the regression line to estimate the average Washington, DC temperature in 1919, to the nearest tenth of
a degree. Show some work.
(b) Use the regression line to predict the average Washington, DC temperature in 2019, to the nearest tenth of a
degree. Show some work.
(c) In what year (to the nearest year) does the regression line predict an average Washington, DC temperature of
63.0 degrees? Show work, solving an appropriate equation.
(d) What is the slope of the regression line and what are the units of measurement? In a sentence, interpret what
the slope is telling us, in the context of this real-world application.
(e) What is the value of the correlation coefficient, r (rounded to 2 decimal places)? Also, interpret its value:
Looking at the graph and the size of r, do you judge the strength of the linear relationship to be very strong,
moderately strong, somewhat weak, or very weak?

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