# Recent questions tagged mathematics

Description : Is it possible to solve a magic square made up of a system of unknown symbols?

Last Answer : No. I could populate a 9×9 magic square with the letters A through I. You would never figure out what numbers were represented by the letters because a 9×9 magic square is not unique.

Description : Did we invent math,or did we discover it?

Last Answer : God invented it.

Description : How many of you can pass this simple test?

Description : How can two infinite sets not have one to one correspondence with each other?

Last Answer : You've missed what an infinite set means. Consider this definition: Infinite sets are the sets containing an uncountable or infinite number of elements. Infinite sets are also called uncountable sets. That is ... . Or for the set of all positive integers and the set of all negative integers .

Description : Using the rays in the diagram, how many different acute angles can be formed?

Last Answer : We don’t do your homework, but this is a simple combinatorics problem. Any pair of those rays will form an acute angle. How many pairs are there?

Description : Can someone help me with my math assignment?

Last Answer : We don't do people's homework here, but we can help in other ways. For instance, some of us can suggest an approach. One would hope, though, that your instructor has already prepared you to ... you take your shot at answering the question, and then post your answer and ask if others will comment?

Description : What’s 0.222222222... as a simplified fraction?

Description : If somebody choose two digit and three digit numbers and their difference is 989.What will be their sum? a) 1000 b)1010 c) 1006?

Last Answer : None of the above. Let x be the three digit number and y be the two digit number. x - y =989. x = 989 + y. x is obviously greater than 989 and less than 1000 (since it is three digits). Since y is a two digit number ... 989 + 10 = 999. We can't go any higher, so x =999 and y=10. x+y = 999+10 = 1009

Description : What do you think of this YouTube video on why you can't divide by zero?

Last Answer : Also are the symbols for Eternity and infinity the same? ∞

Description : Have you ever forgotten something that you didn't think you ever COULD forget?

Last Answer : I still forget my neighbours name. I have known her for 3 years. I forgotten the quadric equation. I remember some math mnemonics but had to look up SOHCAHTOA and roy'g'biv to answer this question. I ... simple things every now and again , and have to look them up online , Fluther , or call family.

Description : How many miles will a person run during a 10 kilometer race?

Last Answer : What kind of mile? There are many.

Description : A magazine company conducted a phone survey asking subscribers to identify the brand of outdoor camping equipment they like best. Every subscriber was surveyed, and the results were printed in an article titled “Most Popular Equipment among All Campers.” Why is the title of the article misleading?

Last Answer : For view, of course. Edit: ok, now I confused. Are you asking what makes the title misleading, or why the magazine makes the misleading title?

Description : Is there a calculation in which infinities cancels out?

Last Answer : There are many asymptotic functions that are expressed as the x or y value approaches infinity. They are not at all uncommon. And the ratio of two such functions would define something like a line. Students of Analytic Geometry as well as Calculus are quite familiar with the occurrence of infinity.

Description : Why do polls say that they are accurate + - 3.00% of the time 19/20?

Last Answer : Maybe it should be + – 3.05%

Description : What do you think of this paper?

Last Answer : The Riemann Hypothesis is one of the most famous of all mathematical problems. If it had been proved it would be newsworthy and we would have heard about it. I am not a mathematician but this proof must be wrong. Scott Aaronson’s blog might be of some help.

Description : What FORMULA of "nth ROOT" ? How do to obtain it with just unique formula?

Description : How can we derive the expression for cross product of two vectors?

Last Answer : Here is a video that shows where the term cross comes from. Two vectors in a 3D space when “multiplied” by each other result in a third vector that represents how they “cross” each other.

Description : What is the probability of getting two pinks balls?

Last Answer : Wow. There are two ways of solving this question. One way uses recursive probability theory and the other way uses an elegant guess. Wrong site for mathematics questions?

Description : To the nearest 10%, what percentage of all numbers contain a 9?

Last Answer : You probably need to clarify that you mean what percentage of the set of all integers contains the digit 9'? Because there are an infinite number of numbers that don't contain that digit (and ... is also an infinite set of digits that does not. Maybe you need to restrict your range some more.

Description : Hey guys, does anyone know the factored form of x3-2x2-x+2?

Last Answer : Welcome to Fluther. Two things: 1. We don't do homework problems or provide answers. If you ask a question of the how do I ? variety, we are much more accommodating. That's just how we roll. (And it ... in a way that'll help you to understand it or get credit for it. But the answer is out there.

Description : Will my final grade drop to a c?

Last Answer : Do the math.

Description : Does a Riemann like hypothesis exist for 10 dimensions?

Last Answer : The Riemann Hypothesis has to do with the distribution of prime numbers and has nothing to do with other dimensions as far as I know.

Description : It's that day again! How are you celebrating Π day?

Last Answer : I know it’s silly but I’m having a piece of pecan pie for dessert tonight. The pie is waiting on the kitchen counter.

Description : What does E = mc2 actually mean in mathmatical form?

Last Answer : I had the same question. How can anything go twice the speed of light? Anyway, I went hunting and researching and I finally understood the equation. But now I forgot. This is going to be good!

Description : What is the difference between one foot squared vs. 12 inches squared?

Last Answer : I don’t understand your question @RedDeerGuy1. A foot is 12 inches. One foot squared is 144 inches.

Description : Does Asia have its own mathematics?

Last Answer : No. Math is the same everywhere.

Description : How much is 5E38?

Last Answer : E is how the calculator expresses overflow by using exponential notation. In most calculators 5E38 would mean 5×10^38.

Description : Is zero an odd or even number?

Last Answer : I think technically it’s even as it’s a multiple of 2 and therefore shares all the traits of even numbers.

Description : What are the shape simplification methods for simplifying the irregular shape geometry as regular geometry?

Last Answer : Not sure if this is at all helpful to you, but from a 3d modelling standpoint, you could subdivide the shape into rectangles and triangles.

Description : Is the previous result of lotteries useful for predicting the numbers of a lottery ticket?

Last Answer : No. Every time is random.

Description : How can I obtain the volume of an irregular body if I just know the vertex coordinates of the irregular body?

Last Answer : answer:There isn't an easy formula, otherwise you would have most likely gotten an answer last time you asked this. So if you have coordinates for vertices, from there you can start to create regular objects ... where you have measured the volume of the total space. It is not easy, but it is doable.

Description : If the universe turns out to be granular (meaning there is a smallest length and a smallest unit of time), is mathematics as it exists today a flawed, or even the wrong tool to describe reality?

Last Answer : That’s irrational. Sure I will agree will you.

Description : Who can introduce me some popular forums about maths？?

Last Answer : answer:Well, there are a few good math questions right here on ask-public. There are also plenty of mathematicians. Here's an interesting math discussion I started not too long ago: http: ... com/158130/if-1901111111-2902222222-3903333333-and-so-on-then-how-come-9909999999/. Option 2: Stackexchange.

Description : What is the order of operations in math?

Description : What does the word Euclid mean?

Last Answer : Euclid was the name of an influential Greek mathematician. Accordingly, the term “Euclidean” refers to things that he contributed to the field of mathematics (e.g., Euclidean geometry or the Euclidean algorithm).

Description : Was mathematics discovered or invented?

Last Answer : GQ. I think discovered, because it exists in nature in a lot of ways. The six sided honeycomb structure for one example. Maybe insects invented it? :) There’s also E=MC squared. There are a lot of fundamental principles based on mathematics. Nice question to make one think.

Description : In math, why do we have to do the order of operations in the order we do?

Last Answer : It’s just agreed upon. I don’t think it matters other than what is agreed upon, to share formulas across the globe.

Description : A matrix question on the Gaussian elimination method?

Last Answer : answer:Are you having trouble setting up the equations? They seem fairly straightforward. The first sentence gives us x + y + z = 110,000. Then .09x + .08y + .13z= 10,435, and finally x + y - 3z = ... got this far, show the work you did for the solution, and I can check to see where you went wrong.

Description : Can you help me to work this out?

Last Answer : You bought it for \$75,00.

Description : Do you think the transitive property of equality is superfluous when we have the substitution property?

Last Answer : Items involved in Transitive are THREE only TWO in substitution.

Description : What's the best math program to manipulate polygons?

Last Answer : Have you tried Google Sketchup? It’s fun, frustrating, and free.

Description : How would you solve this macro economics problem?

Last Answer : I can’t read it could you type it out?

Description : What simple graphics program can do this?

Last Answer : I don’t know of any off hand but it would be easy to code that in Java.

Description : What's the least number of straight lines across America do you need to intersect every state?

Last Answer : You need just one. Just place some black holes at the appropriate positions. They will warp spacetime, so from an outside reference frame, the line will have curves, but from the reference frame of ... around it will intersect every state, and depending on the angle, even every point on the map.

Description : Would you care to debunk a myth?

Last Answer : Age does not always equal wisdom.

Description : Can you check the math on this? (Details)

Last Answer : answer:They don’t add the swipe fee on to the customers bill, they deduct it from the restaurant’s total. The original amount is \$100, not \$103. The swipe fee is deducted from the total charged, so he submits \$100 in charges to the credit card company, they credit his account with \$97.

Description : Is there is quicker way to find the solutions to cos(x) = - cos(3x)?

Last Answer : answer:3x = pi – x + 2npi or 3x = pi + x + 2npi x = (2n+1)pi/4 or x=(2n+1)pi/2

Description : Are there any primes of the form 38^N+31?

Last Answer : The problem with question alike this is you can keep calculating ‘til the cows come home from jumping over the moon, but you’re never going to know for sure until you find a prime that fits the equation.

Description : Is one squared less than one cubed?

Last Answer : They are the same.

Description : What's the most efficient way of locating someone based off knowing their location relative to someone else?

Last Answer : A simplified version of having 3 people and you know the distance of A and B and know C only in terms of closer or further away from A and B, would also be interesting to know if only having 2 people is too difficult.