# Activity Stream

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• Today, 02:27 AM
I am struggling with the following question: Prove the sum of (nCk)*(mCr-k) = (m+n)Cr? In other words, we are required to prove: (mC0)*(nCr)...
0 replies | 1 view(s)
• Today, 02:03 AM
Since I went straight for the deep end had no choice but to keep kicking and sink or swim... lol. .. in case anyone still cares, discovered my...
7 replies | 111 view(s)
• Today, 01:34 AM
Draw a 5×5 grid. There are five rows (numbered 1 through 5, from top to bottom). There are five columns (numbered 1 through 5, from left to right)....
0 replies | 2 view(s)
• Yesterday, 10:59 PM
The order of operations says that division is done before addition. So x + 6/x + 1 means (x) + (6/x) + (1). See the guideline summary. The slash,...
7 replies | 44 view(s)
• Yesterday, 10:56 PM
Whenever you factor anything, check it by multiplying! You factored x^2 + 5x - 6 and got (x+1)(x-6). But when you expand the latter, you get x^2 -...
7 replies | 44 view(s)
• Yesterday, 10:25 PM
OK but why use the parentheses?
7 replies | 44 view(s)
• Yesterday, 10:24 PM
Here is my new solution: I am still not there yet but either I am wrong or the book
7 replies | 44 view(s)
• Yesterday, 10:12 PM
Denis replied to a thread Mean crypt in Math Odds & Ends
Keerect! The deletion indicator = "is not around" (absent).
4 replies | 56 view(s)
• Yesterday, 10:00 PM
Admittedly, when I look up "accurate", all dictionaries define it as "exact". But the OP, in using the phrase "most accurate", makes it a relative...
7 replies | 82 view(s)
• Yesterday, 10:00 PM
You've already told us most of this... If you do not understand what I showed you in the "bank statement", then.... That mysterious "4.07%" is...
8 replies | 114 view(s)
• Yesterday, 09:53 PM
The OP makes that claim in their op and on the youtube page. I agree about comparing "accuracy" of methods; I wondered why the OP claims...
7 replies | 82 view(s)
• Yesterday, 09:50 PM
30% profit means you made back the cost of the item, plus 30% more SO: (normal price) = 1.3*(cost) In the sale, we take 10% off the normal...
2 replies | 94 view(s)
• Yesterday, 09:48 PM
If you haven't read our guidelines, or this summary, please do so. It is important that you show us how you are thinking, so we can tell what help...
2 replies | 25 view(s)
• Yesterday, 09:44 PM
A pencil is a writing implement or art medium constructed of a narrow, solid pigment core inside ... Because the pencil core is still referred to ...
7 replies | 82 view(s)
• Yesterday, 09:36 PM
Where is YOUR work? Show it and we'll check it...
2 replies | 25 view(s)
• Yesterday, 09:36 PM
Technically, the video probably isn't wrong; it doesn't claim to present an exact trisection. At the end it shows something like this: ...
7 replies | 82 view(s)
• Yesterday, 09:35 PM
If events A and B are independent, it means that whether or not one occurs does not affect whether or not the other occurs. In other words, observing...
8 replies | 144 view(s)
• Yesterday, 09:31 PM
No it's not; it's (X + 6)/(X + 1) : make sure you understand why...
7 replies | 44 view(s)
• Yesterday, 09:20 PM
Your factorization of the numerator is incorrect. You started by factoring x out of the denominator; do the same with the numerator, and then...
7 replies | 44 view(s)
• Yesterday, 09:08 PM
oh boy! I sure did I make this more complicated that it had to be. Thank you very much to all 3 members for your contributions and help. ...
7 replies | 111 view(s)
• Yesterday, 09:07 PM
͏ From wikipedia: For any nonzero integer N, an a͏ngle of measure ​2π⁄N radians can be divided into n equal parts with straightedge and...
7 replies | 82 view(s)
• Yesterday, 08:48 PM
you know the sin, so you know an angle. you know there are 1800 in a triangle. and that two angles are equal. and you know 2 sides.
5 replies | 60 view(s)
• Yesterday, 08:40 PM
x3 + 5x2 - 6x = x * (x2 + 5x - 6) = x * (x + 6) * (x - 1) ..... continue....
7 replies | 44 view(s)
• Yesterday, 08:31 PM
I am being asked to reduce this fraction: Here is my solution: The book solution is:
7 replies | 44 view(s)
• Yesterday, 08:19 PM
With a certain level of skill, one can present almost any analysis in a plausible but misleading manner. It is the stock in trade of politicians,...
7 replies | 82 view(s)
• Yesterday, 08:11 PM
mmm4444bot replied to a thread Mean crypt in Math Odds & Ends
💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 ͏ 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 ͏ 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥...
4 replies | 56 view(s)
• Yesterday, 08:06 PM
That is a beautiful presentation. It's also wrong. The figures you drew are "Euclidean" in the sense that they can be made with a straightedge and...
7 replies | 82 view(s)
• Yesterday, 07:55 PM
First thing you should understand is that the set of eigenvectors corresponding to a given eigenvalue form a vector space- there are necessarily an...
1 replies | 71 view(s)
• Yesterday, 07:20 PM
Probably the most accurate method of dividing any angle into three equal parts. Simple and accurate﻿
7 replies | 82 view(s)
• Yesterday, 07:03 PM
And the fact that "logarithm" is a one-to-one function: if log(x)= log(y) then x= y.
2 replies | 30 view(s)
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