# scherz0

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• Lepton

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1. ## Where do I toggle code, when drafting a whole post? I'm NOT referring to the Code button.

Pls see screenshot below.
2. ## Why did your website embed my 2nd separate quotation in the 1st?

At https://www.scienceforums.net/topic/126544-why-did-i-lose-60-on-my-proof-of-generalized-vandermondes-identity-what-was-amiss/, 1. The tags antecede "Beneath is my proof graded 2/5". So why isn't it standing apart and alone? 2. Under ""Beneath is my proof graded 2/5", The 2nd quotation should stand alone and apart too.
3. ## Why did I lose 60% on my proof of Generalized Vandermonde's Identity? What was amiss?

My tests are submitted and marked anonymously. I got a 2/5 on the following, but the grader wrote no feedback besides that more detail was required. What details could I have added? How could I perfect my proof?
4. ## Calculate ways to form a committee of 3 from 8, DIRECTLY WITHOUT ÷?

I grok, am NOT asking about, the answers below. Rather, how can I calculate the final answer DIRECTLY, without division? I don't know why my Latex isn't rendering here? Please see https://math.codidact.com/posts/285679. Orange underline 1. Unquestionably, $\color{#FFA500}{4 \times 3/2} = 3!$ But how can I construe 3! DIRECTLY WITHOUT DIVISION? What does 3! mean? Here's my surmisal. Blitzstein's solution hints to this calculation, but he didn't write 3! explicitly. You fix the first person. Then of the 3 people left, you can pick the 2nd person in your 2-person committee in 3 ways. Is this correct? Red underline 2. Unquestionably, ${\color{red}{\dfrac{8 \times 7 \times 6}{3!}}}$ = 8 × 7. But how can I construe 8 × 7 DIRECTLY WITHOUT DIVISION ? What does 8 × 7 mean? Here's my surmisal. You can pick the 1st committee member in 8 ways, and the 2nd member in 7 ways. But then can't you pick the 3rd member in 6 ways? By this Constructive Counting (p 38 bottom), the answer ought be 8 × 7 × 6??? Why isn't there 6? David Patrick, Introduction to Counting & Probability (2005), pp 66-7.

9. ## Why do these biology textbooks write 'differential' as an adjective, rather than 'different'?

Are these books using 'differential' correctly? Why not just write 'different'? English isn't my first language, and I don't understand the difference between 'differential' and 'different' as adjectives. 1. Handbook of the Biology of Aging edited by Edward J. Masoro, Steven N. Austad. p 480. 2. The Cambridge Companion to the Philosophy of Biology edited by David L. Hull, Michael Ruse. p 46. 3. p 78. 4. Dictionary of Plant Genetics and Molecular Biology by Gurbachan Miglani. Anyone know the page #?
10. ## Oxidation State of S in Sulfolane

Thanks for your reply! I'm just wondering: Would sulfolane be a hypervalent compound? I had some trouble drawing its Lewis structure, especially for the electrons surrounding S.
11. ## Oxidation State of S in Sulfolane

Hello all: I am unsure if my answer to the following answer is correct. Could someone please confirm or refute it? Thank you! P.S.: If someone could tell me how to enter chemical formulas with LaTex without the italics, I would appreciate it as well! --- 1. What is the oxidation number of S in sulfolane $C_4 H_8 O_2$ ? Structure: http://en.wikipedia.org/wiki/Image:Sulfolane-2D-skeletal.png --- Explanation for my work: My answer is +4 for S's oxidation number. According to the image, S is double bonded to the two oxygens so the formula must be $C_4 H_8 SO_2$. Therefore, I treated the $C_4 H_8$ as a nonpolar hydrocarbon part so I assigned C and H oxidation numbers of -2 and +1 respectively. The entire molecule is neutral so I concluded that with $O_2$ being -4 in total (-2/O atom), S must be +4.
12. ## Cellular Respiration

Hello everyone: Could someone please show me how to answer this question mathematically and correctly? I guessed the correct answer. Thank you. --- 1. When glucose -> CO2 + H2O during aerobic respiration, more than 60% of its energy is released as: a) oxygen b) carbon dioxide c) heat d) ATP e) NAD+ Correct answer: [hide]c) heat[/hide]
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