In three cells in a single column in Microsoft Excel, I'd like to be able to input a number in the bottom cell, have the middle cell calculate what a 6% sales tax on the figure below it is, and provide the amount before that 6% tax in the top cell. Any help will be appreciated. The last math class I took was 44 years ago and I didn't pay much attention in that one.
I’m likely relocating to Washington DC this summer and I'm looking for somewhere where I can take Linear Algebra and a few other undergraduate math and statistics classes in Fall 2015 and Spring 2016 as a non-degree student. [more inside]
So I have a few years to kill and I'd like to spend them fully understanding what physicists and mathematicians know about time. I'm not looking for any sort of summary, I want to understand the math from the bottom up. I once caught my father going through the Annus Mirabilis papers with a red pen; that's the sort of proficiency I have in mind. [more inside]
I'm hoping Metafilter can help me with a stupid math question, but one that's bothering me about how I was taught to compound interest versus some numbers I'm reading/hearing online about a Supreme Court case. [more inside]
I'm currently studying undergraduate math and though the concepts are clear, I lose a lot of marks through carelessness or small errors. Please help me pick up on/avoid these better. [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]
I need book recommendations two categories: 1) for myself for review (that are somewhere between high school text books and Spark notes) 2) just straight up textbooks for high school math (algebra i, geometry, algebra ii, trigonometry, pre-calculus) [more inside]
My friend and I are starting an academic blog. We will be posting equations and code snippets (mostly MATLAB), and are looking for a blogging platform that will allow us to enter them easily and display them nicely. Do you have any suggestions on what we should use?
Hey math/fitness nerds. I'm working on a pet project. I'm trying to quantify general fitness levels across a population based on a few different scores. I have the tests, but need help setting up the values of each score. [more inside]
What are some fun, computationally intensive tasks for my new computer to do? [more inside]
I am looking for a resource that lists probability distributions and their common real-world applications. For example, I'd expect to see: Lognormal - daily returns in the stock market. Poisson - failure rates for mechanical equipment, ... [more inside]
Help me do some math? [more inside]
I am in the snowy state of Massachusetts and avoiding my next foray out to shovel. Plus, spouse and I slightly disagree on how often we really need to go out and shovel. Does it really save time to shovel every few hours throughout the storm? I have a suspicion that it doesn't really save time, and that we be just as fine waiting until the end of the snowstorm -- is there a way to think this through mathematically to find a good answer?
Many sites say that the largest known prime is "2^57,885,161 − 1, a number with 17,425,170 digits." Given this and well known research about the density of primes, I think it's at least possible to estimate the number of primes between 1 and 2^57,885,161 − 1. But I don't know how to do this myself. I really want the answer to this one (the order of magnitude at least), but I've got lots of these, and I'd ideally like more cool ones. :) [more inside]
A math problem followed by an issue with the boss. [more inside]
I want to learn math. I signed up for Khan Academy and I like the format a lot. I really like that there are short lessons that I can complete, and that the software automatically checks the answers and lets me continue when I completed a string of 5 good answers in a row (or something similar). I don't like the video explanations though. I'm just not a video person, I learn much better from text. Is there something like Khan Academy where you can do math exercises online but where the explanation is in text?
You want to walk 10 blocks north and 10 blocks east. It would be shorter to walk along the hypotenuse, but the same distance to walk 1 block north, then 1 block east, then 1 block north, etc. it seems that if the blocks were infinitesimally short, it would approximate the hypotenuse, but alas, walking 10 blocks in one direction and then 10 blocks in the perpendicular direction is the same as dividing it up. What gives?
I'd like to understand how Escher made his architectural illusion drawings so I can model similar environments in 3D and then use those models to draw my own creations out on paper. How do I even get started? [more inside]
Sesame Street, when naming parts of shapes, consistently talks about the number of sides and the number of angles. For example a hexagon has six sides and six angles. This makes me crazy. I thought the pointy parts were "corners" or something like that. Doesn't a shape have infinite angles? If any three points can form an angle? Does 180 degrees not count as an angle? Isn't corner a more precise word?
I have an Excel spreadsheet I use to track glucose readings. There’s a value diabetics use called “A1C” which looks at the last three months of readings. It's based on a blood test, but can be estimated by averaging your readings for the last three months. I try to track every day, but I can’t reliably say “look at the last 90 values” – so I’m wondering how to set up a formula to tell it to only look at readings going back 90 days, not necessarily 90 readings. More inside. [more inside]
My curiosity whetted by the first few paragraphs (and double pendulum illustration) of the Wikipedia entry, I want to learn as much and as deeply about chaos theory as possible without needing to know mathematics. Also interested in philosophical implications. Videos? Books or apps or web sites? My math may be weak, but I'm otherwise intelligent, so I'd prefer something much more thorough than, say, "Through the Wormhole" (I realize the math limitation's a huge hindrance, though).
My first grader is asking about multiplication and division. Where do I start? [more inside]
I have a B.Sc in computer science and have one year of experience English using my CELTA qualification. Looking around, I see a lot of requests for people with North American B.Sc's to teach Math/Physics/CS in Asia. I'm trying to decide whether to go and start teaching, or whether it is better to get a state teaching qualification (2yr) in the Netherlands first... [more inside]
I need to use math to figure out how to fill my pill organizer correctly. [more inside]
Entering old age I want to revisit undergraduate mathematics from decades ago. In this plan (fantasy?) I will go through text books & web sources to replicate and extend what I once knew (or what I think I knew!). The problem: a slight finger tremor (nothing lethal or degenerate) makes writing difficult and borderline illegible, even to me. [more inside]
I am currently planning a bar crawl and could use some help. There are 6 groups and 6 bars. Each group will start at a different bar (Stop 1). Each group will then meet up with a different group at Stop 2, Stop 3, etc., totaling 6 stops. Each group will need to meet each other group one time. Ideally, no group would repeat a bar, ie. each group will meet each other group and hit all 6 designated bars. I've been trying to manually chart this and I'm pulling my hair out. Is there a way to figure this out with math or some other voodoo that I'm not aware of?
I want a plain text file listing the English words for number 1-100 (ideally, one per line any delimiter will be fine, I can fix that). One, Two, ..., One Hundred. It's got to be somewhere on this great internet. Can AskMe find it fast?
This will be easy for someone, but math is my second language so I'm at a loss. How do I solve for the percentage of a TOTAL budget, when one line item is unknown (and is part of the total budget)? [more inside]
What are some good, free online resources for an adult who needs to brush up on basic math operations such as working with fractions, percentages and ratios? Other than Khan Academy. The more interactive the better.
Ages ago, I posted this question. Sadly, I'm still stuck in pink collar admin hell and still looking for a way out. I'm not interested in climbing the ladder to get past the admin assistant jobs - I want to get away from this world altogether. More education seems like the only option, but my terrible undergrad record means that graduate school is out. [more inside]
Help me take these numbers and variables and work them into a planning/predictive equation. [more inside]
Please help with this probability related math problem. [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 am part of a group working on a policy document for the mitigation of traffic issues (e.g. speeding). Stakeholders are having a hard time with a particular criteria which reads as follows: "85th percentile speed is in excess of the signed speed limit by 5 mph or more." [more inside]
I'm trying to buy a copy of a famous Russian geometry textbook, Kiselev's Geometry (link to a recent English translation), in the original Russian. Any copy of any edition will do; in fact, a used copy would be mildly preferred. However, I speak no Russian whatsoever, so I'm having difficulty figuring out how to go about this, partly because I don't even know what to search for on a Russian-language site! How can I complete my task? [more inside]
What advice do you have for helping me go back to school in a few years? [more inside]
I want to create a blog for my students to explore math content. [more inside]
In light of this post, are there any programs or initiatives to offer an open, online, mainstream K-12 curriculum available to all students and school districts? [more inside]
I'm running a fantasy football league in which we have 10 teams. The first 9 weeks were round-robin style, with each team playing each other team exactly once. My plan was to schedule weeks 10 through 13 (four weeks) such that each team played a mix of stronger and weaker opponents based on the standings in weeks 1 through 9, then use the week 1-13 results to seed teams for the playoffs in weeks 14-16, but I'm having trouble developing an approach for generating these balanced week 10-13 matchups fairly. Any ideas? [more inside]
I'm coaching a team of 3rd graders for the Math Olympiad. They're a bit young to compete, so it's all about fun this year. Every week they get a packet that is, essentially, extra homework. I want to find some small rewards to give them for finishing the packet. [more inside]
In my last question, I asked for algorithms that changed the world. Now I'd like to know, what are the data structures that changed the world? [more inside]
You're an armchair scientist and you like reading scientific papers. A lot of the fun ones include a lot of equations. You'd like to be able to recreate those equations in a virtual blackboard. You'd select terms and be able to replace them with a library of previous equations you've made. The blackboard would enforce whatever symbolic manipulation rules are required to maintain consistency (because you sure won't be able to). If you replace a term with a number or a data input, it does the calculations necessary to display properly. What is it? [more inside]
I have a set of data: D(t). 5000 samples. Scatter-graphing makes some patterns clear (D-mean increases with t, for instance). D and t are always positive. I want to characterize these, statistically. [more inside]
My eldest child is starting high school. She is in the most advanced math class (a version of geometry) offered by her fairly demanding high school. But my eldest is struggling during the review of algebra -- rate problems, word problems, etc. Concerned because math is cumulative, and I don't want her falling behind. What can I do to help, both with math and with preventing her from becoming discouraged? [more inside]
For my son’s high school history class, he has been assigned an in-class argument/opinion essay. The teacher ended most of the lecturing this week and has given them time to prepare thesis statements for the essays. Here is where it starts to get complicated (at least to my son and me): [more inside]
In one of these puzzle games like 2048 or Threes, where you merge tiles to create higher numbers, is there any way to prove what is the highest possible tile number that can be created given the rules and dimensions? [more inside]
I have always been really bad at really simple games, like the ones where there are generally sound mathematical strategies for playing the optimal game. I'd like to compile a little mental rolodex of simple games and their solutions so I can feel smugly superior to any small children who seek to challenge me. [more inside]
What are your favorite iPad apps for 4 - 7 year olds? [more inside]
I'm interested in learning about the details of English grammar and usage, and also maybe in picking up some prescriptions or guidelines for writing well-styled/balanced prose (a la Strunk & White, though my understanding is that there's potentially a great many schools of thought to look at here). The kicker: my academic background is in math and computer science, including the very formal reaches of things like logic, formal languages, etc. Is there any way that this stuff can help me learn that stuff? [more inside]
I'm helping elementary school kids with their math and English homework. I really need math resources and strategies for helping kids with their reading/writing homework. Some are English language learners. [more inside]