Questions Asked on
August 2, 2007

  1. Chemistry

    Please check my answers for the following questions. THANK YOU. 1) The empirical formula of a compound that is 25.9% nitrogen and 74.1% oxygen is.... ANSWER: N2O 2) empirical formula of a compound that consists of 4.80 grams of carbon, 1.20 grams of

    asked by anonymous
  2. chemistry

    i cant understand anything in carbon and its compounds. can you give me any the basics of what i need to learn in carbon and its compounds Carbon has a usual oxidation state(valence) of +4 and it can bond to itself. Therefore, there are millions of carbon

    asked by dilip
  3. College Algebra

    Solve the system of equations with ROWOPS program. I know how to do the first step but after that it gets difficult for me, this is the system of equations: 3x + y - z = 1 x + 2y - z = 0 2x - y + z = 4 I used to be able to do these but now I'm getting a

    asked by Rebecca
  4. math

    how do I find out how many feet are in 36 yards? i know that 3 feet equals 1 yard. You can multiply 3 times 36 to find the number of feet in 36 yards. You need to learn how to set up your equation and you can convert anything to anything if you know the

    asked by chrissy
  5. Chemistry

    Hi I have two questions and I was hoping someone could help me with them. 1. Classify the following compounds as ionic or covalent a. MgCl2 b. Na2S c. H2O d. H2S 2. Which compound in each pair exhibits the stronger intermolecular hydrogen bonding? a. H2S

    asked by Alekya
  6. english

    Describe the literay elements used in the book Twisted Summer by Willo Davis Roberts? We'll be glad to critique your answer if you post it here. You may get some ideas about the literary elements from the reviews in this site.

    asked by melissa
  7. Maths

    a theory about moth navigation is that moths fly at a constant angle relative to a light source. a particular moth flies at 50 degrees to the light source,L, and it measures its bearing 10 times in one revolution. Hint:one revolution is 360 degrees. 10

    asked by Pauline
  8. math

    ( x2 + 6x-3) x2-4x = (5-x)x2-4x 32x+3- 6.3x+1- 9 = 0 6log5=a and 5log4=b 4log0,24=….. Are these 4 separate questions? Convert the second equation to 25.7 x = 5 then divide both sides by 25.7. Show your work and we will be glad to critique it for you

    asked by princess
  9. mathematics on sports

    can anyone provide me with some sources which has information on how mathematics has been used on sports? e.g., trig can help to calculate the best angle to throw a ball or something, the speed of running can affect the height of high jump etc. etc.? any

    asked by holly
  10. Chemistry

    1) A double displacement reaction takes place when aqueous sodium carbonate reacts with aqueous tin (II) nitrate. You would expect one of the products of this reaction to be. Answer: Sn(CO3)2 2) For the reaction, 3 Cu + 8HNO3 --> 3Cu(NO3)2 + 2NO + 4H2O, if

    asked by anonymous
  11. ??

    2a-3 x a+2 --------------- 4a-6

    asked by chrissy
  12. math

    If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks? (time) x (total mixing rate) = 20 drinks t x [(20/5) +

    asked by michael
  13. algebra

    1)Simplify:(6x^3-16x^2+11x-5)/(3x-2) answer= 2x^2-4x+1-3over3x-2 2)Factor 27x^3-1 completley. answer= (3x-1)^3 if this isnt correct,im not sure how to solve it b/c this makes the most sense to me. 3)Simplify: x^2-3x-28 over x^2-9x+14,assume that the

    asked by erin
  14. math

    I know "!" means e.g. 5!=5x4x3x2x1 but how about [3(n+1)!]/[5n!]? Can you see how n! = n(n-1)!? or that (n+1)! = (n+1)n! ? just like 8! = 8(7!) then [3(n+1)!]/[5n!] =3(n+1)n! / 5n! =3(n+1)/5

    asked by Anonymous
  15. Cultural Diversity

    Muslim and Arab Americans • Describe the impact of Orientalism on Muslim and Arab Americans. • Identify causes of prejudice and discrimination against Muslim and Arab Americans. • Compare and contrast United States-centric views of Muslim and Arab

    asked by Anonymous
  16. Early Child Ed.

    Yes. Temper tantrums are usually caused by a child's frustrations and is strictly emotional. B. is the best answer. By the way, beware of any answer that says "always" or "never." When you're working with people, there are almost no situations that are

    asked by Ms. Sue
  17. mathematics

    If 3/4 of a class is absent and 2/3 of those present leave the room, what fraction of the original class remains in the room? my book says.. if 3/4 are absent, 1/4 are present hows that so? then it says if 2/3 of the 1/4 present , 1/3 of the 1/4 remain

    asked by chrissy
  18. algebra

    can someone help me solve this problem? What is the value of x? (3+2)(6-2)(7+1)=(4+4)(x) (5)(4)(8)=8x 8x=160 I don't get the last part x=20=8+12 where did the 12 come from? Perhaps I am missing something but I think the 8 + 12 is just another way of

    asked by chrissy
  19. Construction safety

    How can an understanding of profit margins assist the construction safety practitioner in achieving safety excellence on a project? I know that profit margins is defined as the difference between the selling price of a product and the costs associated with

    asked by Mary
  20. I have the problem halfway solved

    -9/7x + 8 < -4x - 5 -9/7x + 4x + 8 , -4x + 4x - 5 -9/7x + 4x +8 < -5 The book then has 19/7x + 8 < - 5 I know how to solve this but I am lacking or trying to remeber how they got 19/7 - need a refresher Convert the "x" terms to common denominators 4 x -

    asked by Nik
  21. Algebra

    Simplify 1/r=1/x+1/y Multiply both sides by rxy. Then simplify. I will be happy to check your work. That is as compact and simple as the relationship can be written. Are you looking for an explicit formula for x, y or r?

    asked by Scott
  22. Cultural Diversity

    List two to three characteristics of Orientalism. How may Orientalism and prejudice contribute to hate crimes against these groups? These groups are Muslim and Arab Americans Check these previous answers to these questions.

    asked by Anonymous
  23. thanks

    THANK YOU SO MUCH EVERYONE FOR SHOWING ME THAT ALGEBRA EQUATION YESTERDAY MY BOOK SHOWED ME A DIFFRENT WAY BUT YOUR WAY IS MUCH MORE SIMPLE. MY BOOK TOLD ME THAT WHATEVER IS ON ONE SIDE STAYS ON ONE SIDE OR WHATEVER. I DON'T KNOW. BUT YOUR WAY IS EASIER I

    asked by chrissy
  24. QUESTION

    21n+36n+7 I got 57n+7 my book has 57n+10 how'd they get 10?? also what this all about? how do I do it? 3x2'+4x-6 +2x2'-2x+5 the twos are a little one, slightly above the x I don't know what you are supposed to do for the first one. Is that all the problem?

    asked by chrissy
  25. Geometry - Angle of rotation

    What is the measure of the angle of rotation with respect to two lines that intersect to form a 25° angle? 25 degrees is how much one line is rotated from the other

    asked by John
  26. literature

    we were ask to write an academic essay...i need to know about "horace as a satirist"...what are his contributions in literature??? Here are some excellent webpages on Horace: http://www.kirjasto.sci.fi/horatius.htm

    asked by klar maesen
  27. Health and human services

    How does HIPPA(Health Insurance Portability and Accountability Act of 1996) serve to protect patients rights? I went to www.yahoo.com and searched for hippa patient rights and got these results:

    asked by Janet
  28. Algebra

    Simplify rt= 1/[(1/r1)+ (1/r2)] That looks like the formula for the "total" resistance, rt, of two resistors in parallel, r1 and r2. The t, 1 and 2 are subscripts. It cannot be made much simpler than that, but it can be rewritten 1/rt = 1/r1 + 1/r2 which

    asked by Scott
  29. math

    I am suppose to simplify the following problems: sqrt(x)/x (isn't that already simplified?) e^(1+lnx) (I have no clue.) ln(1/2) (I know this problem translates--> e^x=1/2--> but how would you solve it w/o a calculator?) e^(3lnx) ([e^(lnx^3)]--> is it equal

    asked by Anonymous
  30. Early Child Ed. -- Need help!

    Would you please check these questions and my answers? Let me know the ones I have wrong and need to recheck. 1. Many self-care tasks can be taught through: A. adaptive behaviors B. self-determination C. fencing D. chaining 2. The concept of

    asked by Tamera
  31. chemistry

    I'm sorry, but this is a re-post. I couldn't find the original post;-( so, does anyone have any suggestions for helping a student make a passing grade in college chemistry? She took it twice and didn't pass. Any suggestions would be appreciated. I thought

    asked by jules
  32. ALGEBRA

    DIVISION OF ONW ALGEBRAIC EXPRESSION BY ANOTHER. i KNOW THIS MIGHT BE DIFFICULT TO UNDERSTAND BUT CAN SOMEONE HELP ME LEARN HOW TO DIVIDE THIS?? 8X^3/4X=8/4*X^3/X=2/1*X^2/1=2*X^2 OR 2X^2 (8 x^3) /(4x) = (4*2*x*x^2)/(4 x) The 4's and the x's cancel to give

    asked by chrissy
  33. algebra

    2=(p-2)(p-3) p = 1 or p = 4

    asked by Susan
  34. Chemistry (Thermochemistry)

    Is there any equation out there that links the change in enthalpy (H) to the change in cell potential/voltage (E)? Yes, but the relationship involves the Gibbs Free Energy, which is G = H - TS, snd S is the entropy change. The change in G is approximatly

    asked by Vic
  35. Algebra

    Simplify r=1/(1/x+1/y) multiply the right side by xy/xy

    asked by Scott
  36. Graphing Functions

    Can someone point me to a starting point in graphing f(x)= 25/cos x If it weren't a fraction and a cosine, I'd try to build a table of coordinates. This one, I have no start point. Thanks

    asked by charlie
  37. Math 255

    49n2-84n+36 It looks like a perfect square of 7n-6 to me. check that.

    asked by Susan
  38. math255

    32n2-2 factor 2 out 2(16n^2 -1) The second term is a difference of two squares.

    asked by Susan
  39. algebra

    using quadratic formula 3y2=6+7y 3 y^2 -7y - 6 = 0 When using the quadratic formaul to find y, a = 3, b = -7 and c = -6 y = [-b +/- sqrt (b^2 -4ac)]/2a = {7 +/- sqrt (49 + 72)}/6 = {7 +/- 11)/6 = +3 or -2/3

    asked by Susan