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Where can I find more good ideas for brainteaser puzzles like these? [more inside]

posted by klausman on Jan 17, 2014 - 3 answers

posted by klausman on Jan 17, 2014 - 3 answers

Have a look here. I'm assured that differentiating 1, with respect to *x*, gets you 2. Now 2 is - I think, and correct me if I'm wrong - equivalent to 3. The problem is I can't see how 3 is the result of differentiating 1. What's more, an online solver produces something (that looks) very different. Can someone help me out?

posted by ed\26h on Jan 17, 2014 - 9 answers

posted by ed\26h on Jan 17, 2014 - 9 answers

I've been asked at work to come up with a list of topics that could be included in a training course around basic maths for business people, and I am finding it hard to find suggestions for topics. [more inside]

posted by StephenF on Jan 14, 2014 - 12 answers

posted by StephenF on Jan 14, 2014 - 12 answers

A coin flips three times and comes up heads 2/3. Not suspect.
But a coin flips 100,000 times and comes up heads 2 out of 3 times, that starts to look fishy. The standard probability of this is always roughly 50-50, but assuming a 2/3 ratio pointing to a "rigged" coin, how could you plot the increasing likelihood that a given coin is rigged? [more inside]

posted by ASoze on Jan 8, 2014 - 17 answers

posted by ASoze on Jan 8, 2014 - 17 answers

I have a question about probability math. I am essentially flipping a coin (except instead of a 50/50 chance, my odds are 50.5% heads, 49.5% tails).
I am concerned with the probability of me hitting heads (a 50.5% chance) several times in a row. [more inside]

posted by disillusioned on Dec 25, 2013 - 42 answers

posted by disillusioned on Dec 25, 2013 - 42 answers

What is the slowest-growing non-repeating, non-trivial* whole number sequence? [more inside]

posted by Eideteker on Dec 11, 2013 - 24 answers

posted by Eideteker on Dec 11, 2013 - 24 answers

I'm taking a numerical methods class and there are all these discretization schemes of partial differential equations named after pairs of dudes and they all are kinda the same, maybe a bit different in indexes....
I'm trying to organize it all in my head, like a frat house, with the dudes that worked on the same scheme being roommates, but it seems to be taking a long time to actually "find" a place for each scheme in their "rooms" and keeping it there in a sort of visual arrangement.
Test is no books no notes, and everything kinda of just jumbles inside my head right now.

posted by spacefire on Dec 11, 2013 - 10 answers

posted by spacefire on Dec 11, 2013 - 10 answers

I am going into my last semester of college, and I have signed up to take Calculus III, three years after taking Calc II. This may be a great idea or a terrible one. [more inside]

posted by DRoll on Dec 2, 2013 - 17 answers

posted by DRoll on Dec 2, 2013 - 17 answers

My son is a junior physics/math major at a small midwestern state university. He needs to start looking at graduate programs. He would prefer to stay in research or academia. How can I help him start this process? (B.S. for me) Location is not an issue. It's more a question of what programs offer the best opportunities and fields of study. How can we find out that kind of information? How can I help him start with a reasonable number of candidates?

posted by DaddyNewt on Nov 27, 2013 - 16 answers

posted by DaddyNewt on Nov 27, 2013 - 16 answers

I have to take a math placement test in the next two weeks that will determine which college class I will place into next semester (January). I have already taken Math 1010 (Intermediate Algebra) and 1030 (Quantitative Reasoning) long ago but those credits do not count any longer towards this current placement. I need to test to see where I fall now. I'm hoping to get into Math 1050 (College Algebra) ideally. My skills are rusty though. [more inside]

posted by rabu on Nov 26, 2013 - 9 answers

posted by rabu on Nov 26, 2013 - 9 answers

I work in a University managing the broad based direct mail, email and calling programs. I have zero undergrad or graduate experience with math, business or the social sciences. (Aka, I can write a really nice essay...) I would like to chart a path to being recognized as an expert in predictive analytics. [more inside]

posted by meta x zen on Nov 26, 2013 - 3 answers

posted by meta x zen on Nov 26, 2013 - 3 answers

I like math. Programming is OK, but I don't want to make it my thing. What careers should I be looking at? (Special snowflake details inside.) [more inside]

posted by sqrtofpi on Nov 25, 2013 - 15 answers

posted by sqrtofpi on Nov 25, 2013 - 15 answers

I am looking for adult-oriented iOS apps that will help improve my math skills. [more inside]

posted by Gin and Comics on Nov 23, 2013 - 5 answers

posted by Gin and Comics on Nov 23, 2013 - 5 answers

Physics geeks! Help me save energy! How do I estimate how much less energy will be used by light siding vs gray siding, based on an experiment with small boxes? I made some identical boxes, put them in the sun, measured temperatures, and am trying to figure out how to scale up. The net has info about different roof colors, but not siding colors. [more inside]

posted by amtho on Nov 19, 2013 - 6 answers

posted by amtho on Nov 19, 2013 - 6 answers

Hi, my last questions have been about learning French, then skiing in France (thank you for all those answers to those questions)...and now I'm thinking "what about working in France"? [more inside]

posted by bquarters on Nov 18, 2013 - 8 answers

posted by bquarters on Nov 18, 2013 - 8 answers

I'm a 45 year-old adult who has just been diagnosed with Asperger's Syndrome. At least, my counselor and my ex- both believe I have it. I don't believe I can be an Aspie because I am *phenomenally bad* with *both* computers *and* math (details on request). Are there Aspies like me?

posted by dr. zoom on Nov 14, 2013 - 31 answers

posted by dr. zoom on Nov 14, 2013 - 31 answers

Each card in a certain deck has three letters on it.
The first letter is either A, B, or C.
The second letter is either D, E, F, or G.
The third letter is either H, I, J, K, or L.
Every possible combination is represented exactly once in the deck. Ergo, there are 3x4x5=60 cards in the deck.
How can I determine the probability that a hand of X cards, drawn randomly from the deck, will include at least one of each of the letters?

posted by CustooFintel on Nov 2, 2013 - 32 answers

posted by CustooFintel on Nov 2, 2013 - 32 answers

My girlfriend is applying for to work for the city as a crime lab trainee, a position they will train her for, but will be tested for basic knowledge (they are looking for someone with a two-year degree, apparently in anything). The test will include math. What do you think she will need to be sure she's solid on? [more inside]

posted by Bunny Ultramod on Nov 1, 2013 - 7 answers

posted by Bunny Ultramod on Nov 1, 2013 - 7 answers

I am a frequent buyer of <$5 books on Amazon. Lately I am interested in math treatises but have been unable to find any that aren't way out of my price range. Am I being way too demanding? [more inside]

posted by myitkyina on Oct 20, 2013 - 9 answers

posted by myitkyina on Oct 20, 2013 - 9 answers

How do you describe the basic concepts of a difficult subject you know a lot about that makes it "click" for a beginner? [more inside]

posted by reenum on Oct 11, 2013 - 18 answers

posted by reenum on Oct 11, 2013 - 18 answers

Around 1995 I played a game on the Mac in school that was for educational purposes, supposedly for the purposes of drilling math skills, and had Mozart Symphony no. 40 (1st movement and but I think 3rd as well), Bach BWV 999, and possibly some Paganini as well, as background music. Do you know what it was?

posted by Busoni on Oct 10, 2013 - 4 answers

posted by Busoni on Oct 10, 2013 - 4 answers

I'm giving a public talk about Goldbach's Conjecture. There is a crazy Spanish movie in which a character is famous for having proved the conjecture. Can I show a clip or two from this movie in my public talk? The talk will be in a bar, and there's a $5 suggested donation, so I don't know if that counts as charging people (if that affects the legality of my idea). Thanks!

posted by middlethird on Sep 26, 2013 - 8 answers

posted by middlethird on Sep 26, 2013 - 8 answers

What is the modern equivalent of 1995's lovely LOGICAL JOURNEY OF THE ZOOMBINIS computer games? They taught math logic skills rather neatly for children, but I don't have a computer that will run the old games.

posted by musofire on Sep 25, 2013 - 4 answers

posted by musofire on Sep 25, 2013 - 4 answers

Wizards of Hive,
Before I buy that 90" couch from a friend, how can I make sure I'll be able to get it up my L-shaped stairs? Sure, there are a lot of variables. But is there a tool or methodology for figuring this out ahead of time (presuming I know the depth and height of the couch too)? I don't think I have the cardboard to build a mockup.
This couch is 50 miles away and can't be returned. Thanks!

posted by baseballpajamas on Aug 21, 2013 - 14 answers

posted by baseballpajamas on Aug 21, 2013 - 14 answers

"Math for Smarty Pants" was awesome -- recommend me more books like that for a kid who loves math puzzles. [more inside]

posted by selfmedicating on Aug 7, 2013 - 9 answers

posted by selfmedicating on Aug 7, 2013 - 9 answers

I often find myself crossing interdisciplinary lines and reading research papers, trying to understand some new practice or algorithm in math or computer science. I start out thinking "I just need to understand these basic concepts and I'll crack this", but end up with a very tired brain at 5am, having tried to mainline dense trees of Wikipedia and ~~Eric Weisstein's~~Wolfram MathWorld, and still not feeling like I retained everything. [more inside]

posted by hanoixan on Aug 1, 2013 - 9 answers

posted by hanoixan on Aug 1, 2013 - 9 answers

How do you rejig the formula for CAGR to get the starting value when you know the other variables? [more inside]

posted by MuffinMan on Aug 1, 2013 - 3 answers

posted by MuffinMan on Aug 1, 2013 - 3 answers

I'm drawing/painting a globe (in time lapse, so the sun appears to rise) and trying to figure out what shape, exactly, the longitude (not latitude) lines are when a globe is flattened into a circle (I know I can just trace them, but I've gotten curious). So, the outermost longitude lines are tangent to the circle, they are half-circles, and the centermost line is a straight line from pole to pole, it's the progressively flatter curves in between that I'm trying to figure out. Do they have a name? Are they catenaries? Are they the curves of progressively larger circles? How do I construct them (easily)? Example image: HERE

posted by sexyrobot on Jul 26, 2013 - 11 answers

posted by sexyrobot on Jul 26, 2013 - 11 answers

I'm taking Calc I this fall. I can borrow a graphing calculator for actual exams, but don't want to actually purchase one for day-to-day--or haul it around with me. I have an iPhone and a Nexus 7. Is there a graphing calculator app in one or the other app store that is clearly superior? I'm willing to pay, but under $10, ideally.

posted by Sequence on Jul 25, 2013 - 11 answers

posted by Sequence on Jul 25, 2013 - 11 answers

I'm taking a standardized test on Wednesday with the Government of Canada and they ask individuals four types of questions. The type that I struggle with are the arithmetic problems... **specifically determining the formulas to solve word problems**. I was hoping someone might be able to point me in the direction of a website or easily accessible textbook to practice today and tomorrow before the test. [more inside]

posted by DorothySmith on Jul 15, 2013 - 11 answers

posted by DorothySmith on Jul 15, 2013 - 11 answers

Summer vacations are coming up and I am going to use some of my free time to learn physics and math, subjects that I love. In order to do that i asked collegeconfidential.com if anyone had "exclusive study materials" from their university which they could share. I mentioned that I would like to have acess to tests and exams from other universities and I could give some good materials collected by my colleagues of the physics and math course in exchange. [more inside]

posted by tsuwal on Jul 12, 2013 - 27 answers

posted by tsuwal on Jul 12, 2013 - 27 answers

What is the best option for a working professional to complete two undergraduate level math courses - linear algebra and differential equations - in order to bolster my graduate school application? [more inside]

posted by nowoutside on Jun 30, 2013 - 8 answers

posted by nowoutside on Jun 30, 2013 - 8 answers

Is there some place I can find cross-reference guides to match up material and problem sets between different editions of the same textbook (specifically math textbooks) ? [more inside]

posted by marsha56 on Jun 29, 2013 - 4 answers

posted by marsha56 on Jun 29, 2013 - 4 answers

I have a bitmap of a chart (in polar coordinates) that I would like to convert into a format that some plotting package can recognize, and then retrieve values from the chart at specific intervals. How do I do this? [more inside]

posted by tylerkaraszewski on Jun 28, 2013 - 7 answers

posted by tylerkaraszewski on Jun 28, 2013 - 7 answers

So I am trying to figure out how to charge for a product that is a semi-circle. I charge per square feet.
The client ordered a product that was 25 feet in diameter and 6 feet deep (radius if it were a full circle), then changed it to 20 feet in diameter and 10 feet deep (radius if it were a full circle.
I tried to figure out the area of the space as half of 3.14 x radius squared. But there is no part of the equation accounting for the change in diameter... a little confused since this is the first time we are doing a semi circle.
I feel like the it shouldn't work out to the same price. If I were charging $1 per square foot, what would the difference in price be?

posted by soooo on Jun 26, 2013 - 24 answers

posted by soooo on Jun 26, 2013 - 24 answers

My son is 10 years old and going into 5th grade in the fall (but he usually does 6th grade math). He likes Stack the States, and we're looking for a math app with similar appeal. We already have Sushi Monster and his younger sister loves it, but I'd like something more challenging for him.

posted by The corpse in the library on Jun 25, 2013 - 11 answers

posted by The corpse in the library on Jun 25, 2013 - 11 answers

Help me with statistics and Excel. Especially help me if you know any labor saving methods. I want the median, mean and standard deviation for the average price of all items sold, but my spreadsheet-full-of-data doesn't tell me the price of each sale -- just the average price per store, and the number sold at that store. Something like this: [more inside]

posted by croutonsupafreak on Jun 21, 2013 - 10 answers

posted by croutonsupafreak on Jun 21, 2013 - 10 answers

Dear math people: please help me understand fractions and ratios *intuitively*. [more inside]

posted by*anonymous*
on Jun 19, 2013 -
29 answers

posted by

So I'm beginning a statistics PhD program this fall and I'm concerned that my math skills have gotten rusty since I haven't done anything related for the past two years. I've been working as an actuary since I graduated college but I don't do that much math--mostly a lot of programming. Has anybody been in a similar situation to me? How was the adjustment for you? I'm considering retaking advanced calculus and linear algebra during my first year (probably next summer before I take 2nd year advanced courses) just to refresh myself again. I'm aware some people may think this is kind of pathetic but I'd rather be safe than sorry. Besides, it's only my first year. Is this frowned upon? [more inside]

posted by molamola on Jun 17, 2013 - 15 answers

posted by molamola on Jun 17, 2013 - 15 answers

Math-filter: I have a line chart in Google Docs that plots three columns of data over time. Data in the first two columns ranges from 0-1000, but data in the third column ranges from 3-9. I'd like to "scale" Line 3 (maybe this is the wrong word?) to be able to compare its value over the same graph space as Lines 1 and 2. [more inside]

posted by electric_counterpoint on Jun 12, 2013 - 7 answers

posted by electric_counterpoint on Jun 12, 2013 - 7 answers

My math knowledge ends just past Newton. What books provide a good, relatively general-audience introduction to the past 150-250 years of problems and developments in mathematics? [more inside]

posted by gallusgallus on Jun 10, 2013 - 7 answers

posted by gallusgallus on Jun 10, 2013 - 7 answers

I tutor a boy who is moving from 4th-5th grade. He's at grade level in most subjects, above grade level in reading, but getting an Elvis Presley head in math. Can you help me find ways to help him be less intimidated by math, allowing us more time to learn and practice before his eventual mental shutdown each session? [more inside]

posted by ovenmitt on Jun 9, 2013 - 13 answers

posted by ovenmitt on Jun 9, 2013 - 13 answers

I'm running into trouble with my statistics course. I'm just getting up to t statistics for independent measures research design. My problems are:
1. I'm going through a lot of paper
2. I need to keep all my calculations better organized as a do them
3. I'm flipping back and forth between my book, an online version of the book, and another screen so that I can reference as much material as possible at once. I'm thinking some kind of basic statistics calculator spreadsheet (or any other format) would be in order. Can anybody direct me towards one? [more inside]

posted by Che boludo! on Jun 8, 2013 - 9 answers

posted by Che boludo! on Jun 8, 2013 - 9 answers

I've recently decided to transition to a new career path, accounting. Most firms round here do an online numeracy test as part of the application process.
There is a type of % change question that often comes up and I can't find a proper answer about how to calculate it.
There are two formulae suggested by different websites, but they give different answers. Which is right? (details inside) [more inside]

posted by NoiselessPenguin on May 28, 2013 - 10 answers

posted by NoiselessPenguin on May 28, 2013 - 10 answers

I have a song at 150 bpm, perfectly in tune. I want to repitch it down to around 120 by slowing it down. At which bpms will the notes be at pitch?

posted by semaphore on May 23, 2013 - 6 answers

posted by semaphore on May 23, 2013 - 6 answers

What steps should I take to switch to the aerospace industry from the academic world? [more inside]

posted by vernondalhart on May 21, 2013 - 9 answers

posted by vernondalhart on May 21, 2013 - 9 answers

Please help me pronounce this formula related to projectile motion as it would be spoken out loud: L = v0^2 sin2θ / g [more inside]

posted by misozaki on Apr 30, 2013 - 15 answers

posted by misozaki on Apr 30, 2013 - 15 answers

I want to relearn algebra, chemistry, basic mechanics, and basic physics this summer. For free? [more inside]

posted by Grandysaur on Apr 25, 2013 - 12 answers

posted by Grandysaur on Apr 25, 2013 - 12 answers

I'm taking Calc II at a community college and I'm not getting the grades I want. Studying 10 hours everyday a week in advance only got me an 84% on the first test. It is clear that I'm doing something wrong, but what is it? Help me tweak my study habits before the second test! [more inside]

posted by squirtle on Apr 10, 2013 - 18 answers

posted by squirtle on Apr 10, 2013 - 18 answers