• Working together in Sales

    Updated: 2012-04-28 21:46:37
    Michael Scott, by himself, can close 8 sales in 4 hours. If he works with Dwight, they can close 8 sales in 2 hours. How many hours does it take Dwight

  • rectangle word problem

    Updated: 2012-04-28 20:13:23
    the length of a rectangle is 5 more than the width and the area is 24. Find the length and the width. The formula of the area of a rectangle is A =

  • math and metric system

    Updated: 2012-04-28 19:51:34
    660 centimeters is equal to how many meters? 1 meter = 100 centimeters If it was 600 centimeters instead of 660, you could easily get the answer. 100

  • recipe and fractions

    Updated: 2012-04-28 19:39:09
    you are at a grocery store to buy ingredients for your cupcakes. the recipe requires 4 2/8 a cup of rising flour to make 28 cupcakes. your want to make

  • Happenings – 2012 Apr 28

    Updated: 2012-04-28 18:01:29
    It’s been another slow week. As I said, my alter ego the kid had picked up a recent textbook on seismology… and now I’m looking at continuum mechanics again. Although the impetus is the modeling of solids, I refuse to specialize yet, so I’m still looking at continua in general. And I am beginning to [...]

  • System of linear equations

    Updated: 2012-04-28 07:22:22
    A solid introduction to system of linear equations with real life examples

  • college student

    Updated: 2012-04-28 04:14:40
    Alvin's age is three times Elga's age. The sum of their ages is 40 . What is Elga's age? Let x be Alvin's age Let y be Elga's age x + y = 40 x

  • European Girls' Maths Olympiad conquers Cambridge

    Updated: 2012-04-27 10:37:17
    Skip to Navigation about Plus support Plus Plus sponsors subscribe to Plus terms of use Search this site : European Girls' Maths Olympiad conquers Cambridge by Katy Astley Submitted by mf344 on April 27, 2012 in mathematics education This month 70 teenage girls from nineteen countries including Bulgaria , Saudi Arabia and Finland came to the University of Cambridge to participate in the inaugural European Girls' Mathematical Olympiad EGMO During the six day event , competitors enjoyed a wide range of mathematical and non-mathematical activities Similar in style to the International Mathematical Olympiad IMO but open only to female participants , the standard was extremely high , with seven girls awarded gold medals . Poland was the top-performing country overall , with participants from

  • Age problem

    Updated: 2012-04-26 19:14:36
    Janet and younger brother Jared are 5 years apart. In age the sum of their ages is 13. How old is each. Trial and error 13 = 12 + 1 The difference is

  • Inheritance math problem

    Updated: 2012-04-26 19:05:38
    An inheritance of $1,400,000 is to be divided among Scott, Alice, and Tricia in the following manner Alice is to recieve 6/7 of what Scott recieves, while

  • Mom. How many pens and pencils?

    Updated: 2012-04-26 19:02:54
    Mr. Bower has 3 times as many pens as pencils. He has 20 pens and pencils altogether. How many pens does he have? Solve by trial and error: Say you have

  • How many stuffed animals?

    Updated: 2012-04-26 18:58:23
    Judy and Ramey together have 42 animals. Judy has 12 fewer animals than Ramey. How many stuffed animals does each girl have? Solve by trial and error

  • pizza :}

    Updated: 2012-04-26 18:09:09
    3 friends share 4/5 of a pizza. what fraction of pizza does each person get? The amount to share is 4/5 Since the amount will be shared between 3 friends,

  • Calculate hotel saving

    Updated: 2012-04-26 18:07:23
    The cost of staying one night at a hotel in Amber City is forty-five dollars. The cost of staying one night at a hotel in Bear Lake is one-hundred forty-five

  • Length and Width

    Updated: 2012-04-26 14:22:03
    The perimeter of a rectangle is 138 inches. The length exceeds the width by 65 inches. Find the length and width. P = 2l + 2w l = w + 65 138 = 2( w

  • Max and Mary's Picnic

    Updated: 2012-04-26 01:11:52
    Max and Mary are going on a picnic. Mary packs 4 apples, 3 oranges and 2 bananas. Max packs 2 more apples than marry and 8 more oranges than Mary. If Max

  • Scott Laidlaw and Jen Harris – Inspired by Math #7 (Part 2 of 2)

    Updated: 2012-04-22 15:44:32
    Here's the second part of my interview with Scott and Jen from Imagine Education. Watch this video first, and listen to Part 1.

  • Happenings – 2012 Apr 21

    Updated: 2012-04-21 18:02:24
    There isn’t a whole lot new going on. I did ask the USGS to notify me of magnitude 2.5 earthquakes “in the Bay Area” – and in a week I haven’t seen a single one. So much for daily occurrences! Now, I got to define what area I wanted, and perhaps I made it too [...]

  • New Article in the Journal of Singularities: Volume Four

    Updated: 2012-04-17 18:40:05
    A polynomial generalization of the Euler characteristic for algebraic sets Miguel A. Marco-Buzunáriz, with an appendix by J. V. Rennemo Abstract: We present a method to compute the Euler characteristic of an algebraic subset of C^n. This method relies on classical tools such as Gröbner basis and primary decomposition. The existence of this method allows us to define [...]

  • Interlocking Polyominoes

    Updated: 2012-04-14 22:13:14
    Sid Dhawan was one of our RSI 2011 math students. He was studying interlocking polyominoes under the mentorship of Zachary Abel. A set of polyominoes is interlocked if no subset can be moved far away from the rest. It was known that polyominoes that are built from four or fewer squares do [...]

  • Happenings – 2012 Apr 14

    Updated: 2012-04-14 18:35:19
    Some few of you may know right away what the following picture portends. Back in September I predicted that there would be at least one magnitude 8 earthquake before the end of 2012. As it happens, there were 2 of them on Wednesday of this week, essentially in the same place… offshore near western Indonesia. [...]

  • Free and Affordable iOS Apps for Math

    Updated: 2012-04-12 20:55:59
    With more classrooms incorporating iPads, students and educators are searching for apps to use both in and outside of the classroom. After scouring the web for free and affordable apps, we compiled a list of what we think are six of the best mathematics apps for iOS. Math Ref Free 2.4: This app seems to [...]

  • Rubik’s Cube Game

    Updated: 2012-04-11 01:54:11
    My son Sergei invented the following game a couple of years ago. Two people, Alice and Bob, agree on a number, say, four. Alice takes a clean Rubik’s cube and secretly makes four moves. Bob gets the resulting cube and has to rotate it to the initial state in not more [...]

  • Math Seminar: April 12th 3:30 PM

    Updated: 2012-04-10 20:12:29
    : Behrend Math Blog Math Seminar : April 12th 3:30 PM By MICHAEL RUTTER on April 10, 2012 2:12 PM No Comments No TrackBacks School of Science : Math Seminar Dr . Joe Paullet Professor of Mathematics Penn State Erie The Behrend College Thursday , April 12, 2012 3:30pm 169 Nick A Boundary Value Problem From Fluid Mechanics This talk will investigate a boundary value problem related to unsteady laminar boundary layer flow due to a stretching surface . nbsp The problem consists of a nonlinear third order ODE posed on the positive half line with two conditions prescribed at zero and one at infinity . nbsp Using techniques from calculus and differential equations we will prove existence of a solution for all relevant values of the physical parameters . nbsp Uniqueness of the solution is also

  • Trusses – Example 4, Pratt roof truss with snow

    Updated: 2012-04-10 03:44:43
    This problem, like the Howe truss, comes from J.L. Meriam, “Statics”, John Wiley & Sons, 1966. This diagram actually shows concentrated forces at the joints – which is where they must be for what we’re doing. Nevertheless, the problem as posed says that we have a total weight of 4000 pounds distributed uniformly across the [...]

  • Scott Laidlaw and Jen Harris – Inspired by Math #7 (Part 1 of 2)

    Updated: 2012-04-08 16:34:00
    A mutual friend introduced me some months ago to Jen Harris and Scott Laidlaw. Jen and Scott founded Imagine Education to produce and market an amazing Math Game, Ko's Journey. I rarely promote commercial ventures but I sincerely believe in the work that these two are doing. If you think that Sal Khan is changing [...]

  • Happenings – 2012 Apr 7

    Updated: 2012-04-07 19:35:59
    I’ve been all over the place, mathematically speaking, this past week. Not that that’s unusual. The new book – bought used thru ABEbooks, but new to me – about computer vision came in last Saturday afternoon. I looked through the entire thing as soon as it arrived. It’s “introductory techniques for 3-D computer vision” by [...]

  • Carnival of Math #85 packed with stuff!

    Updated: 2012-04-06 04:05:18
    Check it out!

  • Math Seminar: Thursday - April 5th, 2012

    Updated: 2012-04-04 19:48:48
    : , Behrend Math Blog Math Seminar : Thursday April 5th , 2012 By MICHAEL RUTTER on April 4, 2012 1:48 PM No Comments No TrackBacks School of Science : Math Seminar Ms . Tanya Riston Mr . Gabriel Kramer Penn State Erie , The Behrend College Riston's Title : Finite Distributive Lattices : Abstract In the early 1890s , Richard Dedekind asked himself the following question : Given three subgroups A , B , C of an abelian group G how many different subgroups can you get by taking intersections and sums . The answer is 28. In looking at this and related questions , Dedekind was led to develop the basic theory of lattices , which he called Dualgruppen Lattices , especially distributive lattices and Boolean algebras , arise naturally in logic . nbsp Unfortunately , not much happened in lattice

  • Michael Schrenk on Webbots, Spiders, and Screen Scrapers

    Updated: 2012-04-02 15:43:19
    [Note: I created this podcast for one of my other blogs. It's not math-related but folks who are interested in the Web and in how intelligent agents can navigate the web might enjoy the audio. ] I produced this podcast because I was curious about intelligent web agents and noticed this new edition of Michael [...]

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