My son is in grade 9 and is struggling with maths (this is an ongoing thing). Algebra is everywhere and he has no idea. What are the best online resources for stepping through algebra from the very beginning?
I'm trying to work out the measurements to cut 4 pieces of metal and it's completely wrecking my head. [more inside]
I'd like some help coming up with a formula for calculating annual salary increases. The idea is that a given job description will have two "growth tiers", through which an employee's salary will increase at different rates, and beyond which their salary cannot increase further (except for cost-of-living adjustment). There's also a "base growth factor", which is determined by individual employee performance--e.g. 10% for a stellar employee, 6% for a good employee, etc. Lots more inside. [more inside]
If enriching uranium with a gas centrifuge costs 50 to 60 kW·h (180–220 MJ) of electricity per SWU, is it possible to adapt the formulas given there to calculate the energy needed to extract pure CO2 directly from the atmosphere? (assuming e.g. 0.04% concentration). Asking as a complete science n00b.
I am trying to work how many 5 gram objects can fit into a 3 litre jar. I struggle with conversions of grams to litres and finding the number of objects. Can someone show me how to mathematically work it out. My mind is blank. Thanks in advance :)
I want to compile a list of art works that used chance operations and/or randomness in their creation. I am keen to incorporate pre-20th century, non-Western works, and lots of works by female artists, but anything you can think of will be super helpful. [more inside]
I need to use math to figure out how to fill my pill organizer correctly. [more inside]
I'm interested in teaching high school students mathematics through a tutoring agency. I have the required experience in mathematics, but very little in teaching. This doesn't seem to be a massive problem for many tutoring agencies, but I want to know: do you have any specific tips/advice about teaching mathematics? And more broadly, any advice about applying for and going to work for a tutoring agency? [more inside]
I want to calculate a sequence. It's built on some kind of exponential magic. That is as much as I know. Please hope me. [more inside]
I'm looking for climate science textbooks that take a mathematical approach: that go in-depth with the maths of modelling etc. I'd appreciate if they also had a focus on the science of anthropogenic climate change / global warming. Can you recommend any? [more inside]
Who are some important women in technology that are lesser-known in the world? Especially women of color, LGBTQ women, and non-American women? [more inside]
4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100. WolframAlpha can only give me alternative forms or a solution involving 'real and imaginary parts of z'. Is there a solution I can count on my fingers? [more inside]
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]
Dear math people: please help me understand fractions and ratios intuitively. [more inside]
In high school maths exams students when use Mathematica to solve problems, a syntax error that costs a lot of time to find can lose a student a lot of marks. What strategies can teachers use to reduce the risk or cost of syntax errors to students sitting high-stakes exams? [more inside]
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]
Dear Mefites, a long time ago I got a degree in graphic design but never worked in the industry. Along the way I somehow (don't remember how or why or when) became interested in math and I finished a graduate diploma in maths as a distance learning course in my free time. I am considering applying for masters programmes in maths or related subjects but ... can I? Should I? [more inside]
Mathematics-filter: If there are seven funds with various charges, how can I work out the allocation to these funds of a fixed amount so that the weighted mean charge is below a certain level and the allocations are of similar sizes? [more inside]
Can you think of a method that allows an individual to pseudo randomly create a sequence of numbers (at the very least the randomness is opaque to the minds of other people) assuming said individual may only use his mind and body (no physical tools are allowed)? [more inside]
A colleague alluded to a passage from Sherlock Holmes where all the evidence is re-written as formal logic propositions, leading to a mathematical solution that matches Holmes' solution (and is far from trivial). Does anyone else know where I could find this passage? [more inside]
Say that I have a bag which contains 100 balls and every ball in the bag should be red, but it's possible that one or more of these balls is the wrong colour. How many balls should I look at to be 90% sure that all the balls are red? Or 95%? Or 99.9%? Talk me through how to work this out, please?
I know the price of something now and what the price was 2 years ago - how do I calculate that as an annual percentage increase? [more inside]
Is there any place on Earth that gets the most moonlight? [more inside]
I'm looking to learn how to calculate probabilities for a multi-round dice game. I've researched this question some, and it looks like I might need to know how to use the multinomial distribution, but I can't find any good introductions. Please point me to the most layman-accessible educational material on this subject, and help me to help myself. [more inside]
Maths (math) people of the US: I need your help in working out if certain British conventions would be understood or standard in the US classroom. [more inside]
After tens of thousands of games of pool, every time I rack the balls I seem to switch about half of them around. I know I'm wasting time. So, I want to know exactly how many balls I should normally expect to swap (the median), and what is the most I should ever have to swap. For those of you who aren't pool nerds like me, I've explained the 8-ball racking process inside. [more inside]
What is the difference between floating point accuracy and precision?
How to teach math to a 3.5 year old? [more inside]
My son, who is finishing up third grade, loves math and especially the basic Algebra he's been doing. He is actually sad to be leaving school for the summer because he's so into it. How can I keep this going for him over the summer? Fun books, board games, computer (on-line and OSX) games? [more inside]
Did Anyone Invent Some New Math Stuff So They Could Solve A Problem Which Then Lead To a Technological Breakthrough?
Can you cite any examples where a technological breakthrough wasn't possible until there was some sort of mathematical breakthrough? [more inside]
Help me help my 6yr old with maths. [more inside]
Help me understand the efficacy of a headbutt as an offensive opening gambit in a bout of fisticuffs... [more inside]
Need help from Math and IT geeks :-) Long question inside. [more inside]
Which probability distribution should I use to model examination results? [more inside]
Maths-filter: please recommend some good resources (books, sites, software) for learning about numerical simulations of large (like 20+ dimensional) dynamical systems, especially in continuous time. [more inside]
But Sir, what is x? Teaching students algebra for the first time. They keep wanting to put values in for x, and write that down. E.g. x + x = . Becomes 1 + 1 = 2, in their books. Whereas I want x + x = 2x. Does anyone have any strategies, or techniques to overcome this? [more inside]
Statistics! I need to use them at work, but over the past few years numbers seem to make my head spin. Any tips for parsing them? Any recommended books for someone who only scraped a C at GCSE Maths? [more inside]
How do I reduce something by -800% when I'm working with a scale between -99% and 99%? [more inside]
Help! I need (in a hurry) to put my matlab images into a latex document. I'm exporting them as eps files, but when I put them in the latex file, all the text (legends and axis labels) have vanished. I can't find a solution on google. I can't use jpg instead because it looks crap. Why is the text in my eps file not showing up??
Where can I find a proof for the strong order of convergence of the Euler-Maruyama or Milstein schemes used to model stochastic differential equations?
Can someone help me with a maths problem please, how to find y for a given x on a curve? [more inside]
If I multiply 1¢ by 10¢ I get 10¢? However, if I use the same monetary amounts and express them as dollars and then multiply them: I get $0.01 * $0.10 = $0.001, which is obviously a different answer to 10¢. I know this is wrong and but how and why?
What are some good, maths, word, movie, logic games that can be played with just your mind in the dark?
I am looking for games/mental activities you can play with nothing but your mind. [more inside]
I have a list of 6 items. I need to make a list of unique combinations where 3 items are taken from the list in any order and the 4th item is also taken from the same list but cannot be one of the 3 items already selected [more inside]
I have a list of 10 questions to help prepare for an exam. Of these 10 questions, 6 will be selected for the exam paper. Of the 6 on the exam paper I need to choose 3 to write an essay on. How many do I ACTUALLY need to research to be okay on the day? [more inside]
I'm trying to find a website that teaches vector mathematics in lesson form. [more inside]
Wolframm's "A New Kind of Science" is a very thick book that would require a significant investment of time to read through. I'm interested in the computational modeling of complex adaptive systems and have heard it recommended as an interesting read. I've also seen it described as a huge load of crap. Is it worth the bother?
What is the next step of this Kenken? [more inside]
Please explain what calculus is to a dummy. [more inside]
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