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Here is the answer sheet for the midterm.
Use the suggested practice problems from the midterm revision guide (p. 276).
Thursday, January 14, 2010
Tuesday, January 12, 2010
Scribe Post
Today we reviewed the Midterm Study Guide to start out with. OB explained what the exam will look like (25 multiple choice questions), and when it will be (2nd period Tuesday). Logically, we should have 3 minutes per question, and 5 extra minutes. We'll have Chapter 1, 2, and, as well as Section 9.1-9.3 which we just worked on. We'll have calculator for some portions, and some without. OB explained how the answer sheet will work. We'll have to rank the questions, in order for which we think is most likely. We'll get 8 points for a first choice being correct, 4 points for a second choice being correct, 2 for a third, 1 for a fourth, and none for a 5th. Hopefully, we should have at least a point on every question, meaning that we were able to identify which one was wrong every time.
OB gave us problems that we can use to review for the mid-term. We can bring in one 3x5 card, with anything we want to use, except for examples with actual problems in them, and they have to be in our own handwriting. We can also get extra points from out cards if we are on the 'border' or changing our grade higher. We then calculated fake grades, with Q1=85, Q2=83, and Exam=69, with a semester grade of 79, etc...
After we played around with our imaginary grades, we got our Homework, which is our "Sequences & Series Practice" Sheet. All we have to do is do the Sheet, and the homework at the bottom for next class. We reviewed questions 19, 29, 53, 57, 79, 63, 77, 73, 83, and 89 from last class's homework. Most of this was review, but we introduced another factor to a previous equation. When we are dealing with
, we have to include, If 
.
Otherwise we should use)}{1-r} "S_n=\frac{a_1(1-r^n))}{1-r}")
.
We also got the formulas that we need for the midterm:
Arithmetic Sequence Formulas:
d "a_n=a_1 + (n-1)d")
,
and "S_n=\frac{n}{2}(a_1 + a_n)")
.
Geometric Sequence Formulas:
 "a_n=a_1(r^{n-1})")
,
}{1-r} "S_n=\frac{a_1(1-r^n)}{1-r}")
,
and
.
Next Time's Scribe is Nathan.
OB gave us problems that we can use to review for the mid-term. We can bring in one 3x5 card, with anything we want to use, except for examples with actual problems in them, and they have to be in our own handwriting. We can also get extra points from out cards if we are on the 'border' or changing our grade higher. We then calculated fake grades, with Q1=85, Q2=83, and Exam=69, with a semester grade of 79, etc...
After we played around with our imaginary grades, we got our Homework, which is our "Sequences & Series Practice" Sheet. All we have to do is do the Sheet, and the homework at the bottom for next class. We reviewed questions 19, 29, 53, 57, 79, 63, 77, 73, 83, and 89 from last class's homework. Most of this was review, but we introduced another factor to a previous equation. When we are dealing with
Otherwise we should use
We also got the formulas that we need for the midterm:
Arithmetic Sequence Formulas:
and
Geometric Sequence Formulas:
and
Next Time's Scribe is Nathan.
HW and midterm revision guide
Midterm exam revision guide
HW
HW
- Sequences & Series revision sheet
- Be prepared for a homework quiz covering all Unit 4 homework, including revision sheet (time to ask questions before the quiz)
- Organize Unit 4 homework to be submitted by 2:15 Friday
Friday, January 8, 2010
Scribe Post 1/8/10
At the beginning of class people had questions with the homework problems at the end of the assignment using the sum of the first n terms of any arithmetic sequence formula, #67, 69, 71, 85. We started with the warm-up which was doing the half-sheet of arithmetic sequences and series which was passed out to us last class. Mr. Obrien explained how make a table with arithmetic sequences to find the common difference. The graph of a arithmetic sequence has a linear graph, y = mx + b. He also reminded us to always check our answers for n by simply testing it.
Mr. Obrien showed how to solve the nth term without using the formulas, which was much quicker. For example:
,
, 9d + 
= 
, 9d + 16 = 43, 9d = 27, d = 3. So instead of using formulas you can find 
without them. = 3n + 4. Because 3 is the difference so it is the nth term, then since you know = 16, 4 x 3 = 12 + 4 = 16, so you found the nth term without using the formula.
We learned about Gauss's formula of finding how to find the sum of numbers 1 through 1000. So 1001 x 500 = 500500. The formula for this is:
.
Next students put up the answers to the questions from the homework that students had questions on. Mr. Obrien explained that there are three numbers between 10 and 12, 10, 11, 12. This sounds simply, but it is helpful to understand when doing problems such as #69 on the homework. Next he passed out a yellow half-sheet. We started by defining a geometric sequence:
= r x 
To finish class we filled in the formulas on the yellow sheet which we will use for tonights homework.
Mr. Obrien showed how to solve the nth term without using the formulas, which was much quicker. For example:
We learned about Gauss's formula of finding how to find the sum of numbers 1 through 1000. So 1001 x 500 = 500500. The formula for this is:
Next students put up the answers to the questions from the homework that students had questions on. Mr. Obrien explained that there are three numbers between 10 and 12, 10, 11, 12. This sounds simply, but it is helpful to understand when doing problems such as #69 on the homework. Next he passed out a yellow half-sheet. We started by defining a geometric sequence:
To finish class we filled in the formulas on the yellow sheet which we will use for tonights homework.
Wednesday, January 6, 2010
Monday, January 4, 2010
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