Friday

December 2, 2016
Total # Posts: 376

**PreCalc**

What is the real solutions of this equation? sqrt(2x+3)-sqrt(x+2)=2

*August 16, 2008*

**Math**

thank you!

*July 26, 2008*

**Math**

When a rock is put into a tank full of water, water is displaced and is collected by a container. If the base of that container is 12cm x 15cm and the water level is 4.5 cm, what is the volume of the rock?

*July 26, 2008*

**Redox Half Reactions**

Half reaction of 2 Al2O3 + 3 C → 4 Al + 3 CO2

*May 24, 2008*

**Aluminium Bauxite (is water needed)**

Is water needed in the extraction of aluminium from bauxite in either the Bayer or Hall-Heroult proccesses? Please reply as soon as you can :) hehe

*April 20, 2008*

**Maths**

i knew that was wrong, coz my answer should be in the 50's haha..thanks though, great help can i ask how you got sinA and sinB with that information :) no point in me just copying it i would like to know how you got it

*April 17, 2008*

**Maths**

well, i got: (-4/5)(12/13) - (4/5)(7/13) therefore (-48/65) - (28/65) therefore: answer = (-76/65)

*April 17, 2008*

**Maths**

yeah that's right, can u go on?

*April 17, 2008*

**Maths**

if cosA = 4/5; sin <0; cosB = 12/13; 0<B<90, determine sin(A-B) thanks ... :)

*April 17, 2008*

**Science**

I desperatly need help, i need to know everything there is to know about the recovery of ALUMINIUM that is recovered from BAUXITE ORE, the process, the cost, everything. Please, if you have any knowledge or know of any GOOD webpages, please post them here. thanks:)

*April 17, 2008*

**science**

What is the difference between RNA and DNA that can be used to separate them from one another?

*April 9, 2008*

**Math**

Factorise: a)x squared - 5x b)x squared - 81

*April 7, 2008*

**geography**

name at least two state capitals that have two or more words in their names

*April 2, 2008*

**Chemistry**

What are compunds that are composed of molecules called?

*March 12, 2008*

**Chemistry**

The nuclide 12 N 7 is unstable. What type of radioactive decay would be expected??? my guess is either gamma or beta. are either of those correct?

*March 4, 2008*

**Nuc. Chem**

Oh okay so for this one would it be: 40 Ar 18???? thanks so much for your help!

*March 4, 2008*

**Nuc. Chem**

HELP!!! I have like 20 of these kinds of questions on my homework and no clue how to solve them. Electron capture transforms 40 K 19 into what nuclide?!?! Thank you

*March 4, 2008*

**Trig word problem**

A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point C, how far is it ...

*February 24, 2008*

**trigonometry**

In triangle ABC, a=8, b=15, and m<C=40 degrees. Find the area of the triangle to one decimal place.

*February 24, 2008*

**trig WORD PROBLEM**

A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point C, how far is it ...

*February 24, 2008*

**trig**

In triangle ABC, find <A to the nearest tength of a degree is m<B=95 degrees , b=15.4, a=8.0

*February 24, 2008*

**trig**

Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is:

*February 24, 2008*

**pre algebra**

2x+3y=6 2x=6-3y [subtract 3y to solve for x] x=(6-3y)2 [divide by 2 to get x by itself] 2x+3y=6 3y=6-2x [subtract2x to solve for y] y=(6-2x)/3 [divide by 3 to get y by itself]

*February 24, 2008*

**CHEMISTRY**

could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...

*February 21, 2008*

**science**

nucleotide monomers a nucleotide is composed of: A Nitrogenous Base (purine or pyrimidine) A Five-Carbon Sugar A Phosphate Group

*February 20, 2008*

**Chem Urgent!**

the atomic mass in the periodic table represents the number of grams per one mol of lead. so there are 207.1 g per mol of lead.

*February 20, 2008*

**French**

oui, partager [the infinitive of partage] means share.

*February 20, 2008*

**AP CHEM-URGENT PLEASE**

could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...

*February 20, 2008*

**Chemistry**

HELP! we just started kinetics and i have no clue how to solve this problem. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g...

*February 20, 2008*

**Chemistry**

thanks!

*February 14, 2008*

**Chemistry**

why does the value of i (van t' hoff factor) change with regards to theoretical vs. experimental? i'm not quite sure what happens but i know it has to do with ions in the solution. could it be attractive forces between ions?

*February 14, 2008*

**CHEMISTRY**

thank you so much! the molar mass was a major problem...i didn't realize i was so off. thank you for pointing that out.

*February 14, 2008*

**CHEMISTRY**

For a lab, I have to find the experimental values of i (Van T'Hoff factor). so far this is what i have, but it's incorrect. could you please tell me what i'm doing wrong??? thanks. given info: the lab varied the concentration of Mg(NO3)2 the theoretical value of i ...

*February 14, 2008*

**Chem=continued**

thank you. i'm confused thought....i tried to use a formula that already had molality in it because i don't have a mass to use, hence the g/GMW kg portion. i need to use 175 mL and make it boil at 245 degrees F.

*February 11, 2008*

**Chem=continued**

I'm currently working on a lab in which I have to make the solution boil at 245 degrees F. The solution will be a mix of ethylene glycol and I have to caluculate the volumes of water and solute needed to make the solution. here's my work so far. X= mL C2H4(OH)2 175mL-X...

*February 11, 2008*

**AP CHEM**

I'm currently working on a lab in which I have to make the solution boil at 245 degrees F. The solution will be a mix of ethylene glycol and I have to caluculate the volumes of water and solute needed to make the solution. here's my work so far. X= mL C2H4(OH)2 175mL-X...

*February 10, 2008*

**math**

Tom is now 25 years older then his son. In 10 years, Tom will me 5 years younger than 3 times his sons age. how old is tome now?

*December 15, 2007*

**math**

there are 50 question in a test. a student gains 2 marks for a correct anwser and loses 1 mark otherwise. if a student has 76 marks, how many question did he answer incorrectly?

*December 15, 2007*

**math**

an apple cost 20 cent and a orange cost 25cent. if the total number of apples and oranges is 20 and the total cost is 4.55, how many oranges are there?

*December 15, 2007*

**math**

omg ty u are a super pro

*December 15, 2007*

**math**

There are 9 more quarter then dimes.if the total value of the coins is 6.8, how ,any quarters are there?

*December 15, 2007*

**math**

how do you solve for 2/3 * ? = 20

*October 24, 2007*

**science**

what is a set of actions that a living thing is born with and does not need to learn called

*October 17, 2007*

**Physics**

dont no

*September 13, 2007*

**Algebra II**

Solve x^2>_2x+24 x^2-2x-24>=0 (x-6)(x+4)>=0 So as long as x>6, it works. But what about two negatives? Try x=-5..checks...check me on that. So it looks as if -inf<x<=-4 works, and 6<=x<inf works. check that.

*August 8, 2007*

**Algebra II**

Write y=x^2+4x-1 in vertex form. y=x^2+4x-1 y=(x^2+4x+8)-1-8 y=(x+2)^2-9 This isnt one of my answer choices,what am I doing wrong? in second line: y=(x^2+4x +4 )-1 +4 (take one half of the middle coefficient, then square it) y=(x^2+4x + 4 )-1 - 4

*August 8, 2007*

**Algebra II**

Solve x^2+2x=-2 by graphing and indicate the roots.Please and thank you We can't draw graphs for you here. The roots are x = -2.73 and -0.73 I suggest you make your own graph of y = x^2 + 2x and see where it crosses the horizontal line y = -2. Choose x values of -4, -3, -2...

*August 8, 2007*

**algebra II**

Help me solve this problem that I missed, so that I can see where I went wrong. Synthetic Division (3X3 -2x +5). (x-2) I would set it up with the following algorithm to do synthetic division (this is how I do it and how I taught it, the ----- are simply there to keep the ...

*August 7, 2007*

**Documenting a website for research paper**

I cant find it in my text book, can someone tell me how you document a website for the bibliography. also in parenthetical foot note things in the paper do you just use the author of the website? oh also, if the site doesnt tell the author??? (Broken Link Removed) Hold your ...

*July 2, 2007*

**Alexander the great fact**

I have a research paper due shortly and well when i was taking notes i didn't label a few of them(stupid i know) so now, I returned the books to the library, and i wrote the paper, and one fact which I think is good is that the seers he brought with him said the gods were ...

*July 2, 2007*

**math**

8 workers together at the same rate finished a painting job in 5 hours. hour long would it take 12 such workers working at the same rate to finish the same job? each worker finished____(fraction) of the job in one hour. 12 workers finished_____(fraction) of the job in one hour...

*April 13, 2007*

**Physics**

The 2-cm (radius) current loop shown in the figure is changing from Î¸1 = 11 degrees to Î¸2 = 66 degrees in a magnetic field 2 T in 0.5 seconds. What is the magnitude of the induced emf to the nearest hundredth of a millivolt? The wire in Problem 2 has ...

*March 27, 2007*

**Research Paper**

can someone tell me what the MLA style is? my textbook is requiring it for my paper but is not explaining it? Here are some MLA websites; the first one is the most thorough and the best: (Broken Link Removed) http://owl.english.purdue.edu/owl/resource/557/01/ Please repost if ...

*March 9, 2007*

**Japan**

social studies) Question:How many distance is Japan from the US? It is 6760 from New York Ciy to Tokyo It is 4791 miles from Seattle to Tokyo It is 3862 miles from Honolulu to Tokyo It is 2444 miles from Anchorage to Sapporo Take your pick The last entry (2444 miles) is ...

*January 22, 2007*

**word riddle help please**

what material is something that a person doesn't have?

*December 11, 2006*

**lively**

Suppose that four times the square of a number equals 20 times that number. Whatis the number? It'll take you 45 seconds if you just plug in a few numbers Again -- putting the subject in the subject line helps. =) 4 n^2 = 20n zero is one solution. Solve for n.

*November 26, 2006*

**lively**

Suppose that the width of a certain rectangle is three-fourths of its length, and the area of that same rectangle is 108 square meters. Find the length and the width of the rectangle If you put the correct subject in the subject line, you're likely to get a faster response...

*November 26, 2006*

**Economic**

marketing

*November 26, 2006*

**Research Paper**

I have to write a research paper but I don't know what to pick as a topic. I want something simple. Last time i chose Napoleon and it was overwhealming. Can anyone suggest a simple topic that is easy to research. Preferable historical. Mozart disco John Kerry some topics ...

*November 3, 2006*

**world geography**

The native people of Australia are known as

*November 1, 2006*

**communications**

simple subject notes Please explain more exactly what you need and we'll be glad to help you.

*October 11, 2006*

**science**

d. a beak and wings

*September 25, 2006*

**Math**

which fraction is less than 6/7 a)9/8 b)8/9 c)10/8 d)13/14 e)5/9

*September 15, 2006*

**physics**

what is is called (both terms) when somthing makes a sound but no one is aroun to here it? Plz this is 4 my h work It could be many terms. Unobserved Source comes to mind. Surely you are not wasting much class time in physics class on this.

*September 6, 2006*

**maths**

what is the largest domain of the following functions f(x)=3x-5 f(x)=square root of (x+4) f(x)= 2 over x-4 f(x)= sqaure root of (x2-9) f(x)= 2 over x(x+7) Hopefully you've solved these by now. I just noticed the question and see there's no reply. The question is "...

*September 1, 2006*

**Type Sketch - Cynic**

I have to do a type sketch of a cynic...but i really am running out of ideas...this is what I wrote so far but i need a couple more points. Any ideas please? ************************************* The cynic is a person who is skeptical of life. They are weary of the motives of ...

*July 14, 2006*

**Report on Middle Class Today!**

I got this assignment and I have to do it TODAY! Write an essay on the necessity of a content, hard-working, middle class to the maintenance of a democratic government. I really have no idea what to write and i need to have it done today. Can anyone please give me some ...

*June 28, 2006*

**History - Vercingetorix**

I have to write a report on the Gallic king Vercingetorix. It needs to be 1 - 2 pages long but I cannot find very much information on the web.(ive seen Wikepedia ect..) Could anyone refer me to a website containing information on him? I have to finishe this report in 2 days. ...

*June 19, 2006*

**Algebra 2**

I have no clue on this one. How would you solve: us the (IN) key to express each number as a power. Then use the rules of logarithms to find the answer. (45,332 x 10^5)(33,654 x 10^-4) ------------------------------- 93,153 (that is a fraction.) please help.

*June 18, 2006*

**Algebra 2**

how would you solve: the current in the river flowed at 3 mph. The boat could travel 24 mph downstream in half the time it took to travel 12 mi upstream. what was the speed of the boat in still water? please help. The time required to go any distance upstream a distance L is L...

*June 18, 2006*

**MATH EMERGENCY!!**

Please help. I know I asked this before, but the answer was lost during the upgrade. Show that 0.00317 is a rational number by writing it as a quotient of integers. (the 317 has a line over it.) please help. thats hard really hard im in grade 5!!!!

*June 15, 2006*

**Algebra2 again**

How do you: Complete the square as an aid in graphing. [I put exponents in ().] y = x(2) + 4x - 2 Please Help? The complete square of the x^2 binomial is x^2 + 4x + 4 = (x+2)^2 Therefore, add 6 to each side of the equation and you will have this still-valid equation with a ...

*June 11, 2006*

**Algebra2**

How do you get: Show that 0.00317 is a rational number by writing it as a quotient if integers. (the 317 has a line above it.) Please Help? Bob Pursley showed how to do that very question in an earlier post. Look back perhaps 2-3-4 days and you will find it. I did look earler...

*June 11, 2006*

**math question corrected**

a farmer bought chickens, goats and sheep. the cost of a chicken is .50 goat is $3.50 and sheep is $10 He bought 100 animals and spent $100. how many of each animal did he buy please help! I need this for school tomorrow Since you have two equations and three unknowns, there ...

*August 18, 2005*

**math**

a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how many of each animal did he buy If this is an algebra problem, you need to know the cost of each animal. There is not enough information. sorry, the cost of a chicken is .50 goat is $3.50 and ...

*August 18, 2005*

**math**

a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how much of each animal did he buy a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how much of each animal did he buy I assume he bought all of each animal. It is ...

*August 18, 2005*