course phy122 This system is all new to me. Please provide feedback as to whether I am doing it correctly.Thanks,
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08:36:23 `q001. Explain the difference between x - 2 / x + 4 and (x - 2) / (x + 4). The evaluate each expression for x = 2.
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RESPONSE --> In the former you would divide 2 by x first, in the latter you will solve what is within the parenthesis and then divide the results. First: 2-2/2+4 = 2-1+4=5 Second:(2-2)/(2+4)=0/6=0 confidence assessment: 3
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08:41:41 `q002. Explain the difference between 2 ^ x + 4 and 2 ^ (x + 4). Then evaluate each expression for x = 2. Note that a ^ b means to raise a to the b power. This process is called exponentiation, and the ^ symbol is used on most calculators, and in most computer algebra systems, to represent exponentiation.
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RESPONSE --> Fisrt is 2 to the power of x, then plus 4. Second is 2 to the power of x plus 4. so: 2^2+4=4+4=8 2^(2+4)=2^6=64 confidence assessment: 3
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08:47:07 `q003. What is the numerator of the fraction in the expression x - 3 / [ (2x-5)^2 * 3x + 1 ] - 2 + 7x? What is the denominator? What do you get when you evaluate the expression for x = 2?
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RESPONSE --> Numerator is x-3. Denominator is [(2x-5)^2*3x+1]-2+7x -1/(1*6+1)-2+14 -1/7-2+14 -1/19 = -0.05 confidence assessment: 2
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08:54:16 `q004. Explain, step by step, how you evaluate the expression (x - 5) ^ 2x-1 + 3 / x-2 for x = 4.
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RESPONSE --> I fell hook line and sinker for the previous one. I understand why x was not part of the numerator and if I had done that I would of come out ok. q4: (x-5)^2x-1 + 3/x-2 (4-5)^4 - 1 + 3/4 - 2 1-1+0.75-2=-1.25 confidence assessment: 2
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08:56:58 *&*& Standard mathematics notation is easier to see. On the other hand it's very important to understand order of operations, and students do get used to this way of doing it. You should of course write everything out in standard notation when you work it on paper. It is likely that you will at some point use a computer algebra system, and when you do you will have to enter expressions through a typewriter, so it is well worth the trouble to get used to this notation. Indicate your understanding of the necessity to understand this notation.
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RESPONSE --> I need to put things on paper. I also need to be comfortable with the keyboard method of notation, as it will be used throughout the course. I also need to pay more attention to what I am doing. self critique assessment: 2
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RESPONSE --> it is important to know order of operations and in standard notation self critique assessment: 2
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23:16:44 `q005. At the link http://www.vhcc.edu/dsmith/genInfo/introductory problems/typewriter_notation_examples_with_links.htm (copy this path into the Address box of your Internet browser; alternatively use the path http://vhmthphy.vhcc.edu/ > General Information > Startup and Orientation (either scroll to bottom of page or click on Links to Supplemental Sites) > typewriter notation examples and you will find a page containing a number of additional exercises and/or examples of typewriter notation.Locate this site, click on a few of the links, and describe what you see there.
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RESPONSE --> it shows standard notation and typewriter notation of the same problems confidence assessment: 3
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23:17:12 You should see a brief set of instructions and over 30 numbered examples. If you click on the word Picture you will see the standard-notation format of the expression. The link entitled Examples and Pictures, located in the initial instructions, shows all the examples and pictures without requiring you to click on the links. There is also a file which includes explanations. The instructions include a note indicating that Liberal Arts Mathematics students don't need a deep understanding of the notation, Mth 173-4 and University Physics students need a very good understanding,
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RESPONSE --> yes self critique assessment: 2
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23:17:31 while students in other courses should understand the notation and should understand the more basic simplifications. There is also a link to a page with pictures only, to provide the opportunity to translated standard notation into typewriter notation.
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RESPONSE --> ok self critique assessment: 2
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