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Older Activity
Today,
02:27 AM
Masaru
started a thread
Why is the sum of (nCk)*(mCr-k) equal to (m+n)Cr?
in
Intermediate/Advanced Algebra
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)...
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0 replies | 1 view(s)
Today,
02:03 AM
Njords
replied to a thread
Upper Sums - Generalized expression in terms of "n" - (est. of area under curve)
in
Calculus
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...
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7 replies | 111 view(s)
Today,
01:34 AM
mmm4444bot
started a thread
Cryptic Word Square by Guy Jacobson & Kevin Wald
in
Math Odds & Ends
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)....
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0 replies | 2 view(s)
Yesterday,
10:59 PM
Dr.Peterson
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
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,...
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7 replies | 44 view(s)
Yesterday,
10:56 PM
Dr.Peterson
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
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 -...
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7 replies | 44 view(s)
Yesterday,
10:25 PM
allegansveritatem
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
OK but why use the parentheses?
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7 replies | 44 view(s)
Yesterday,
10:24 PM
allegansveritatem
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
Here is my new solution: I am still not there yet but either I am wrong or the book
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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).
see more
4 replies | 56 view(s)
Yesterday,
10:00 PM
Dr.Peterson
replied to a thread
Trisection of an angle
in
Geometry and Trig
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...
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7 replies | 82 view(s)
Yesterday,
10:00 PM
Denis
replied to a thread
How to calculate a fixed rate of interest on a Balloon Payment loan
in
Finance/Business Math
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...
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8 replies | 114 view(s)
Yesterday,
09:53 PM
mmm4444bot
replied to a thread
Trisection of an angle
in
Geometry and Trig
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...
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7 replies | 82 view(s)
Yesterday,
09:50 PM
j-astron
replied to a thread
Percentage profit: Calculate the percentage profit on a computer sold in the sale.
in
Arithmetic
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...
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2 replies | 94 view(s)
Yesterday,
09:48 PM
Dr.Peterson
replied to a thread
PreCalc help!!
in
Intermediate/Advanced Algebra
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...
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2 replies | 25 view(s)
Yesterday,
09:44 PM
Denis
replied to a thread
Trisection of an angle
in
Geometry and Trig
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 ...
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7 replies | 82 view(s)
Yesterday,
09:36 PM
Denis
replied to a thread
PreCalc help!!
in
Intermediate/Advanced Algebra
Where is YOUR work? Show it and we'll check it...
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2 replies | 25 view(s)
Yesterday,
09:36 PM
Dr.Peterson
replied to a thread
Trisection of an angle
in
Geometry and Trig
Technically, the video probably isn't wrong; it doesn't claim to present an exact trisection. At the end it shows something like this: ...
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7 replies | 82 view(s)
Yesterday,
09:35 PM
j-astron
replied to a thread
Why are mutually exclusive events not independent?
in
Probability / Statistics
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...
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8 replies | 144 view(s)
Yesterday,
09:31 PM
Denis
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
No it's not; it's (X + 6)/(X + 1) : make sure you understand why...
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7 replies | 44 view(s)
Yesterday,
09:20 PM
mmm4444bot
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
Your factorization of the numerator is incorrect. You started by factoring x out of the denominator; do the same with the numerator, and then...
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7 replies | 44 view(s)
Yesterday,
09:08 PM
Njords
replied to a thread
Upper Sums - Generalized expression in terms of "n" - (est. of area under curve)
in
Calculus
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. ...
see more
7 replies | 111 view(s)
Yesterday,
09:07 PM
mmm4444bot
replied to a thread
Trisection of an angle
in
Geometry and Trig
͏ From wikipedia: For any nonzero integer N, an a͏ngle of measure 2π⁄N radians can be divided into n equal parts with straightedge and...
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7 replies | 82 view(s)
Yesterday,
08:48 PM
sinx
replied to a thread
Calculate a side in a non-right angled trangle
in
Geometry and Trig
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.
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5 replies | 60 view(s)
Yesterday,
08:40 PM
Subhotosh Khan
replied to a thread
what is wrong here
in
Intermediate/Advanced Algebra
x3 + 5x2 - 6x = x * (x2 + 5x - 6) = x * (x + 6) * (x - 1) ..... continue....
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7 replies | 44 view(s)
Yesterday,
08:31 PM
allegansveritatem
started a thread
what is wrong here
in
Intermediate/Advanced Algebra
I am being asked to reduce this fraction: Here is my solution: The book solution is:
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7 replies | 44 view(s)
Yesterday,
08:19 PM
JeffM
replied to a thread
Trisection of an angle
in
Geometry and Trig
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,...
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7 replies | 82 view(s)
Yesterday,
08:11 PM
mmm4444bot
replied to a thread
Mean crypt
in
Math Odds & Ends
💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 ͏ 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 ͏ 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥 💥...
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4 replies | 56 view(s)
Yesterday,
08:06 PM
topsquark
replied to a thread
Trisection of an angle
in
Geometry and Trig
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...
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7 replies | 82 view(s)
Yesterday,
07:55 PM
HallsofIvy
replied to a thread
Normalization and value of eigen vectors for A = [[1 1 0][1 1 0][0 0 1]]
in
Advanced Math
First thing you should understand is that the set of eigenvectors corresponding to a given eigenvalue form a vector space- there are necessarily an...
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1 replies | 71 view(s)
Yesterday,
07:20 PM
A.Pechatnik
started a thread
Trisection of an angle
in
Geometry and Trig
Probably the most accurate method of dividing any angle into three equal parts. Simple and accurate
see more
7 replies | 82 view(s)
Yesterday,
07:03 PM
HallsofIvy
replied to a thread
Logarithm solving problem
in
Advanced Math
And the fact that "logarithm" is a one-to-one function: if log(x)= log(y) then x= y.
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2 replies | 30 view(s)
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