Midterm 2 solutions & grading keys: version A, version
B
Instructor
Ioana
Dumitriu
PDL
C336
Phone: 2066168164
Email:
dumitriu 'at' uw.edu
Lectures
MWF
12:301:20pm THO
101
Office hours:
W
1:30 3:00pm (MSC)

Topics
 Math
124 Materials Website. This website is a great
source of information, and it also has a large number
of exams from previous quarters. More on this below.
 The Math Study Center (a very important
resource that you are urged to use).

Math 124 Materials Website
This is a common web page for all sections of Math 124 taught this
quarter at the University of Washington. Here is a link
to it. Please read all the information on this page very carefully.
The following documents at this site are particularly important:
This web site also contains links to your weekly worksheets and
exams from previous Math 124 courses. The topics covered in these
exams vary somewhat from instructor to instructor. A packet
containing all the worksheets and old finals from the above website
can be purchased from the Bookstore (see Textbook
below).
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Math Study Center
The MSC is one
of the best resources at your disposal: a place that's almost
always open, where you can speak to and get help from tutors,
professional mathematicians, and fellow students. Unless you are
100% comfortable with this class, check the MSC out.
The MSC is
located at B014 CMU
(the Communications Building, across the street from Padelford).
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Grades
Your grade is determined by how you do relative to the class as a
whole. Grades will be distributed proportionally between exams
(quizzes, midterms, final), homework, and worksheets, as follows:
 Worksheets (total)
5%
 Homework (total) 15%
 Quizzes
(total) 15%
 Midterm
1
15%
 Midterm
2
15%
 Final
35%
Total:
100%
Note: although things vary from year to year, past experience
teaches that to get a 3.9 one needs over 90%, to get a 3.0 one
needs over 77%, and to get a 2.0 one needs over 60%.
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Worksheets
Most weeks we will have worksheets that will be done during Quiz sections on Tuesdays,
except for the weeks of the Midterms
and Final. You will do these problems in small groups and your
TA will help you work through them. Worksheets give you enough
supervised practice to go off and do the homework. They may also be
used to introduce new ideas and methods that have not been covered
in lecture. Treat the worksheets seriously, as they help you learn
how to think and write mathematics with your TA present to help you
if you make a mistake.
 It is your responsibility to bring the worksheet (printed from
the Math 124 Materials Website) to your
Quiz section.
 Your TA will will keep a record of your participation and
performance in the worksheet sessionsthey count toward your
grade.
 The lowest weekly worksheet score will be dropped.
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Homework
For homework submission, access, and scoring,
we use WebAssign. Here is a stepbystep set of
instructions on how to register for WebAssign and begin accessing
your homework (courtesy of Dr. Jennifer Taggart).
 Open a web browser.
 Go to http://www.webassign.net/washington/login.html
 Click on the "LOG IN" button. You will be asked to log in to
your MyUW account. You should then be taken to a page with
access to your Math 124 F assignments.
 Under "My classes" drop down menu, select our class. You
should then be able to see your current and past assignments,
homework scores, etc.
 To find your way around the WebAssign website, you can use
the "Guide" and "Help" links in the upper right corner.
 Your first homework assignment, hw01S10.1, visible on January 1, 2017, is due
at 11:00pm on Friday, January 6.
 When you open a homework assignment, you will see various
boxes which need to be filled with answers. Sometimes the
answers are numeric,
e.g., 1.25 or 5/4, and sometimes they are symbolic, e.g., 2x +
x^{2} . A palette of mathematical symbols is
provided to allow you to enter symbolic notation.
 When you open a homework assignment, you have the option to
submit an answer OR save your work for later. You can also
print out the entire homework, work on it away from the
computer, then return and enter answers later.
 On each question (unless yes/no), you are allowed 5 tries
to enter the correct answer. After that, the correct answer
pops up and you are given 0 on that particular submission.
 You will find that many of the problems have "randomized"
numbers in them. For example, on a particular problem your
homework may involve working with the equation 2x^{2 }+
3y^{2} = 7 . However, when you look at your
friend's homework, the same problem might instead involve the
equation 3x^{2 }+ 5y^{2} = 7 .
These slightly randomized changes insure that no single answer
key can be posted online for everyone to use.
Assignments are due throughout the week; you will not be able to
work on them past their due time.
Each assignment is worth a number of points; the total number of
points accumulated throughout the quarter will help calculate your
homework percentage. The lowest 2 assignment scores will be
dropped, and the percentages will be calculated based solely on
the rest.
Important: Since most of the grade will be based
on exams, it is essential to understand fully how to solve the
homework problems and to acquire enough practice to be able to solve
problems relatively quickly. The homework is meant to stretch your
thinking beyond the lectures, and to help you master the subject,
and thus it may (and will) be harder than the examples covered in
lecture. Questions on exams draw from all the activities of the
course such as the lectures, worksheets and homework. Do not assume that
only homework problems will be asked on tests.
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Quizzes
 There will be a 15minute quiz on the Thursday of weeks 2, 3,
4, 6, and 7. These will usually cover the preceding homework,
and will be very similar to the homework problems. The TA's will
grade them and return them to you the following Tuesday.
 The quizzes
are closed book/closed notes and no calculator.
 There are no makeup quizzes.
 The lowest quiz score will be
dropped.
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Midterms and Final
 There will be 2 midterm exams. They will be given on the
dates listed below. They are meant to take 50 minutes but you
can take the full 80 minutes of the Quiz section.
 Midterm I : Tuesday, January 31 in Quiz
section.
 Midterm II : Tuesday, February 21 in Quiz
section.
 The final exam will take place on Saturday, March 11, from 1:304:20pm (170
minutes), location TBA.
 You must bring a Photo ID to all exams.
 For both midterms and for the final, you are allowed to use
one (doublesided) handwritten 8.5x11 sheet of notes.
 See Calculator Policy below.
 There are no makeup exams. If you
have a compelling and
welldocumented reason for missing a test, speak
to the professor about it.
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Teaching Assistants and Quiz Sections
On Tuesdays and Thursdays you will meet with a Teaching Assistant
in a smaller group. This gives you a chance to get more of your
questions answered.
The Tuesday sections are 80 minutes long so that, in addition to
getting help with your homework, there will be time for working on
the Worksheets. The midterm exams will be
administered during the Tuesday sections, on January 31 and
February 21.
During weeks 2, 3, 4, 6, and 7
there will be a 15minute
quiz on Thursdays.
The TAs are:
Sections 
Times and Locations 
Name 
Office 
Email 
FA

T 10:3011:50, FSH 109

Robert Jeffs

PDL C20

rajeffs 'at' uw.edu


Th 10:3011:20,
FSH 109




FB

T
12:001:20, SWS 032

Robert Jeffs

PDL C20 
rajeffs 'at' uw.edu 

Th 11:3012:20, FSH
109




FC

T
10:3011:50, MUE 154 
Varodom Theplertboon

PDL C8E

vthep 'at' uw.edu 

Th 10:3010:20,
THO 235




FD

T
12:001:20, FSH 109

Varodom Theplertboon

PDL C8E 
vthep 'at' uw.edu 

Th 11:3012:20,
ART 003




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Textbook
and WebAssign Code
You are required to buy
 a "WebAssign access code". You can purchase the standalone
code, which includes the electronic version of the textbook,
from the Cengage website; or you can purchase it at the
bookstore (more expensive at the bookstore, but subject to an
eventual 10% rebate). More details on how to do this on the Departmental Website
for Math 124.
Because of the above, the textbook for the course is recommended,
not required:
 "Calculus, 7th Edition, Early Transcendentals " by Stewart.
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Calculator Policy
 The only allowed calculators are Ti30x IIS  $14.95
at the bookstore.
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Expectations
 You are expected to read this Note
to the student.
 You are expected to read the entire contents of this website
and familiarize yourself with all the policies.
 You are expected to read the appropriate chapters in the book,
and all supplementary
material from the website in
addition to coming to lectures.
 You are expected to
understand the concepts, in addition to being able to apply them
to numerical problems.
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Tips for getting a better grade
 Read the book. Knowing recipes to solve numerical problems is
helpful, but not enough. You need to understand the concepts;
you will be asked questions that test this understanding.
 Due to the amount of material that needs to be covered, this
class goes at a very fast pace (and neither I nor your TA can do
too much about it). This is why the "Note to the student"
stresses the fact that you need to put in an additional
15 hours per week (aside from the time spent in class),
working on your own.
 A good way to find out if you understand something is to
explain it to someone else. You might be surprised to find out
how hard it is to accurately reproduce/explain something that
you think you understand.
 Write clearly and correctly. Be logical in your arguments, and
learn the definitions and theorems accurately. Due to the size
of the class, we must evaluate you based mostly on your written
workso it is very important to convey your knowledge precisely
in your writing.
 Do your homework. Even if you do understand the material, it
is hard to reproduce it on a test if you have not practiced.
Working quickly is important in this class, and speed cannot
come without practice.
 Come to office hours (both mine and your TA's), go to the MSC,
and come talk to me or to your TA if you are having trouble. Let
me know early in the quarter if you are having problems with the
course for whatever reason.
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Guidelines for writing up solutions to
problems (during exams)
 You must show all your work in order to get full credit,
therefore you need to explain all your steps and methods
clearly.
 It must be apparent to the grader that you did this work by
yourself, and he/she must understand your logic.
 You are urged to use words to give such explanations as
needed.
 Try to put yourself into the grader's shoes when writing:
after writing up a solution, ask yourself if someone else in the
class could follow it. Is the solution clearly organized, or
must one look for it in various corners of the page? Is it
clear how each step follows from the previous? Are there any
"miraculous" transitions that require further explanation?...
 Make it easy to grade your work. Keep in mind that, as much as
one always tries to be objective, statistics show that a grader
who is frustrated with a writeup can sometimes involuntarily be
harsher.
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Back to Ioana Dumitriu, the Department of Mathematics,
or University of Washington.