Most popular questions and responses by yengiang
  1. Discrete Math

    I was hoping if you could help me to solve this problem. Thank you. A department wants to schedule final exams so that no student has more than one exam on any given day. There are 7 vertices of degrees 3,3,4,4,4,5,6 which show the courses that are being

    asked on April 22, 2011
  2. Discrete Math

    Let A={0,1,2,3,4}. Define a function f from A to A by f(n)=2n mod 5. a/ Is f one-to-one? b/ Is f onto? Could you show me how to solve this problem, please? I have no idea what this function is. Your help is greatly appreciated.

    asked on April 16, 2011
  3. Discrete Math

    Please help with this problem. Thanks a/ Show that for any real number x, if x>1 then |x^4|=< |23x^4 + 8x^2 + 4x| b/ Show that for any real number x, if x>1 then |23x^4 + 8x^2 + 4x| => |x^4| c/ Use the big Theta and big O-notations to express the results

    asked on April 29, 2011
  4. Discrete math

    (The set of all such that) A={n in Z| 2 divides n} B={n in Z| 3 divides n} Both are contained in the universal set U=Z a/ What is A union B? b/ What is the complement of A?

    asked on May 9, 2011
  5. Chem

    A synthesis reaction occurs between 15.0g of gallium and 15.0g oxygen. 1- Write a balanced equation. Ga + 02 --> Gao2 (I got this part) 2- Setup two factor labels to determine the mass of product possible considering each reactant. Please help #2. I don't

    asked on February 3, 2013
  6. math-10th

    Simplify 7x^2+45x+18/(x^3+12x^2+36x) Please help. Thank you.

    asked on November 10, 2012
  7. Persuasive Writing help

    I'm writing a persuasive request but English is not my native language. I've done many drafting and revising, but still not sure. so I would be grateful if you could show me what I did wrong and the correct way to revise it. Thanks "Dear xxx, I would like

    asked on March 27, 2014
  8. Discrete Math

    "The cube of every real number x is greater than or equal to x, and we can see that since 2^3=8>=2." ? Is this a correct argument?

    asked on May 7, 2011
  9. Math - 10th grade

    Simplify: (1-i)^3 Here's how I break it down using the formula (x-y)^3 but I just don't know how to get to the final answer. Please help. = 1-3i+3(i)^2-(i)^3 Thank you

    asked on October 27, 2012
  1. Math - 10th grade

    Please explain why i^2=-1

    posted on October 27, 2012
  2. Discrete math

    a/ Sorry, it was what's A intersection B?

    posted on May 9, 2011
  3. Discrete Math

    Yes, there's a typo. It's actually 3+4+4+4+4+5+6=30 and there's a graph included in this problem but I don't know how to show the graph so that was why I just described how it looked like with all the vertices and degrees of each. Let me list those

    posted on April 22, 2011
  4. math help!

    30! = 2 ^ 26 * 3 ^ 14 * 5 ^ 7 * 7 ^ 4 * 11 ^ 2 * 13 ^ 2 * 17 * 19 * 23 * 29 = 2.652528598 * 10^32

    posted on April 16, 2011
  5. Math 123

    $125 x 0.15 = $18.75/per month then multiply by 12 months = $225 is the amount of interest she owes at the end of the year. Total balance is: $125 + $225 = $350

    posted on April 16, 2011
  6. Discrete Math

    Thank you so much for your replies. Could you also verify what I did on this problem please? The set of course numbers for a collection of math courses is: M = {0099,1111,1113,2200,2210,2220,2300,2450,2500,3500,4500,4900} Define a relation R on M by (x,y)

    posted on April 16, 2011