Questions Asked on
August 2, 2007

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 
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 
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 
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 
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 
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 
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 
math
( x2 + 6x3) x24x = (5x)x24x 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 
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 
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 
??
2a3 x a+2  4a6
asked by chrissy 
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 
algebra
1)Simplify:(6x^316x^2+11x5)/(3x2) answer= 2x^24x+13over3x2 2)Factor 27x^31 completley. answer= (3x1)^3 if this isnt correct,im not sure how to solve it b/c this makes the most sense to me. 3)Simplify: x^23x28 over x^29x+14,assume that the
asked by erin 
math
I know "!" means e.g. 5!=5x4x3x2x1 but how about [3(n+1)!]/[5n!]? Can you see how n! = n(n1)!? 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 
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 Statescentric views of Muslim and Arab
asked by Anonymous 
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 
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 
algebra
can someone help me solve this problem? What is the value of x? (3+2)(62)(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 
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 
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 
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 
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 
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 
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'+4x6 +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 
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 
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 
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 
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 
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 
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 selfcare tasks can be taught through: A. adaptive behaviors B. selfdetermination C. fencing D. chaining 2. The concept of
asked by Tamera 
chemistry
I'm sorry, but this is a repost. 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 
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 
algebra
2=(p2)(p3) p = 1 or p = 4
asked by Susan 
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 
Algebra
Simplify r=1/(1/x+1/y) multiply the right side by xy/xy
asked by Scott 
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 
Math 255
49n284n+36 It looks like a perfect square of 7n6 to me. check that.
asked by Susan 
math255
32n22 factor 2 out 2(16n^2 1) The second term is a difference of two squares.
asked by Susan 
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