Please help me with some basic math: The circumference of a circle is 8 inches. Extend that circle by 8 inches from circumference (i.e. adding 16 inches to the diameter). Now what is the circumference of the larger circle? [more inside]
I'm writing a story and it has to do with time dilation and I don't want it to be one of those stories where people roll their eyes and say, "Well... It's just a story." I want accurate math. I suck at math. [more inside]
Basically, what it says. I've been brushing up on my math skills via Khan Academy, and I'm running into a problem I hit when I was in school. Basically, the math *concepts*, like Algebra, Trig, and the like? I'm able to get really easily. But, manipulating the numbers and doing the basic arithmetic? Hard. Sometimes even with a calculator, I'll miss carrying over a negative sign, and I'll get the problem wrong, despite knowing the concepts really, really well. What's going on here? Is my ADHD not under control? Are these symptoms of Dyscalculia? What? Ideas, hivemind! [more inside]
Which would be the correct way to subtract coordinates that are on different sides of the equator? [more inside]
Need to do a simple analysis around pay and experience fairness. Example: Two project managers managing exactly same kind of projects and have similar performance levels: PM 1 -> Pay $130,000 ; Experience 15 years; PM2-> Pay $80,000 ; Experience 3 years; I want a mathematical way of analyzing if the person getting paid $80,000 is being under payed. Now I know there are industry standards and charts available. I want to do something that may not be perfect but gives a sense. How much weight should be given to experience and can this be factored in mathematically? Please dont get hung up on accuracy. I want a logical analysis method that does not need to be entirely accurate. Also, where can I find industry charts comparing pay and experience
I'm learning how to do dosage calculations in class - I'm terrible at math/dimensional analysis, and I am afraid I am going to overdose/underdose/kill all of my future patients! How do I quell my panic and embrace this aspect of my job? Advice from animal and human nurses especially appreciated. [more inside]
Can a math / electrician whiz help me figure out how much my little space heater is costing me to run? The heater is listed as 120V 60Hz 1500W, and I run it on its highest setting for about 8 hours a day. According to my last utility bill, my electric was $118.64 for 1536 kWh, or $0.077239583 per kWh. So how much is this little heater costing me to run per hour?
Ask MathaFilter: If I square 100 mm I get 10,000 mm. But, convert to .1 m, and square, we have .01, a smaller amount! Why can using a conversion like this give a nonsensical answer? If I want a length times itself why does it matter the metric?
Has anyone heard of the mathematical "proof" that the concept of similarity is objectively meaningless? [more inside]
Now that I'm back at college, I'm having serious trouble with an elementary course in Discrete Mathematics (for computer scientists). How can I complete this course? [more inside]
I'm starting a new job soon where I will be using Matlab a whole lot. I've used Matlab (and Octave) before and know the basics, but I want to become an expert. What book should I buy, or what other resources should I look into? [more inside]
What's the best way to think about mathematics? What's the best advice you have ever received about learning math and approaching math problems? [more inside]
When calculating a statistical average, is it reasonable to remove outliers? [more inside]
Mathfilter. Bonus: involves football and beer [more inside]
I'm looking for an awesome video/discussion topic that relates to street maps - something appropriate for a HS geometry course. [more inside]
What is the difference between floating point accuracy and precision?
How does a non-science major structure a self-guided science/engineering course of study? [more inside]
Can anyone help me come up with a pub trivia points system? [more inside]
Math exercises for kindergarteners? [more inside]
MathFilter: Help me calculate the location of points with lots and lots of distances. [more inside]
I'm teaching myself to code (Python, mainly), and it's going well, except I keep on running into one big problem: I haven't done any math since high school (6 years ago). I used to be top of my class, and now I can't do simple word problems anymore. This gets tough because they inevitably pop up in the books I'm using, and then I stop dead in my tracks. Could anyone recommend a couple of books or web resources to help me get back up to speed? I never took Calculus, so a good Calculus book would help, too. [more inside]
A while back I read about an english professor who claimed to have a strong personal interest in mathematics. Assuming that he doesn't use math in a professional setting, how would this interest manifest itself? Completing math textbooks? Reading books about math? Memorizing the first 1000 primes? What would someone with an interest in math do? [more inside]
What math flash card game, which required you to use each of four numbers on a card to get to one fixed answer each time, did I play in grammar school? [more inside]
Help me make an awesome connect-the-dots for middle school math nerds. I'll take care of the math, you take care of the art. Don't let these poor kids be stuck with my cat/walrus. [more inside]
Does anyone remember this educational computer game? [more inside]
How do you pronounce the hyperbolic trigonometric functions? [more inside]
How should prize money be divided in order to generate the most high-quality submissions to a contest? [more inside]
Homework help!? Solving a second-order linear ODE. [more inside]
I used to be math nerd, but I've forgotten most of it because, despite what I was told in high school, I don't use vector calculus in the Real World. I've used textbooks to brush up on old topics before, but self-imposed homework just isn't very fun. What hobbies/projects/??? can I take up to take advantage of any derive enjoyment again from my math background? [more inside]
How do I analyze 7 years of past orders to determine how to best organize my 6 shelves of widgets for packing future orders? Each shelf should, on average, be picked from equally. [more inside]
I have forgotten basically all of math, and I want to learn it again from the ground up. [more inside]
Knowing basic algebra, what math would I need to learn so that I could eventually program fractal movies? [more inside]
I have a B.S. in Math, but I haven't been able to find a job in my field. What can I add to my undergrad degree to be more competitive in the job market? [more inside]
Attention mathletes! Help me with some real-life algebra. [more inside]
What would the check-digit be on this string: K1506235620? [more inside]
Probability Question [more inside]
Calculusfilter. A man is led to the center of a valuable field which he does not own. He coats his feet in blue paint so that his path can be traced. At dawn he begins walking. At a randomly selected time he will be told to stop walking, whereupon he will walk in a perfectly straight line back to the starting point. Then he will be given all the land that has been circumscribed by his blue path. [more inside]
I run an online cake contest (link in profile) with a judging panel. Is my scoring methodology the most efficient/accurate? [more inside]
What are the best math instructional sites, resources and (especially) tools for graphing and math visualization these days? [more inside]
What is the shortest possible program (in any well-known programming language) that will count up indefinitely and display the output as it's counting? [more inside]
What are some basic math concepts I can use to understand and develop a ranking system? [more inside]
I am redesigning a high-school Algebra course so as to make it more meaningful to the students. To that extent, I am trying to gather as many examples throughout our world of linear relationships. I was hoping to tap into the collective wisdom of this group to come up with as long a list as possible of linear relationships that actually exist (not contrived stuff). I once knew a teacher who had a plant that grew at a linear rate. I don't know the type of plant, however. And there are so many other linear relationships around us. I don't want everything they see be about a car's distance from home or the amount of money they saved. What do you know of that exhibits a linear relationship? I'd love to have a long list for students so that they see that studying linear relationships in Algebra really does matter. Thanks for any help in making this course more worth while to the students!
Any good math or physics neckties? [more inside]
"the average number of molecules in a rock band" [more inside]
Consider two rings that are intertwined. (These lie in 3-dimensional space, but when you draw it on paper it looks like a venn diagram.) In 3-dimensional space they cannot be unlinked. The questions is, if you had one more dimension, can you unlink them?
What does a bivariate cubic polynomial look like? [more inside]
When should calculators be used in math class? What are good criteria for determining if a calculator should be used on a given set of problems?
I'd like to be able to watch the Macy's fireworks from my dad's roof on the Upper West Side. How can I figure out if I'll be able to see them? I have some variables, heights, distances, and video... [more inside]
Can someone help with a probability question? [more inside]