Thursday

August 25, 2016
Total # Posts: 1,038

**Chemistry**

For High Performance Liquid Chromatography (i.e. HPLC), can the column be flushed with Isopropanol (i.e. IPA)?
*August 24, 2011*

**Math**

Explain why the perimeter:Area ratio value can be used to understand cost effectiveness
*August 21, 2011*

**math**

Draw a rectangle with a perimeter of 58 m and an area of 120 m square
*August 21, 2011*

**Chemistry**

Help :) I got this Chem homework to research on the Taxonomy of Living Things and on the species to kingdom. Anyone can help where I can find this? :) Thank you
*August 13, 2011*

**Precalculus**

Awesome thanks mathmate!
*August 6, 2011*

**Precalculus**

I used that formula sin^2x+cos2x=1 -1/4 squared minus that by one and squareroot it square root of 15 over 4
*August 6, 2011*

**Precalculus**

dont you use the formula sin2 theta =2sintheta cos theta?
*August 6, 2011*

**Precalculus**

wait i dont understand how you did your math?
*August 6, 2011*

**Precalculus**

If sinx= -1/4 and x terminates in the third quadrant, find the exact value of sin2x My answer is sqrt-15/8
*August 6, 2011*

**Precalculus**

Find the exact value of sin 15°. I got square root of 2-squaroot of 3/2 is that correct?
*August 6, 2011*

**Precalculus**

120 degrees?
*August 6, 2011*

**Precalculus**

2-3cosx=5+3cosx 0 degrees is less than or equal to x less than or equal to 180 degrees Can you please show me step by step in detail. Please do not skip a step. Thanks!
*August 6, 2011*

**Precalculus**

oh i get it.... how do you know what identities to use? did you memorize them?
*August 6, 2011*

**Precalculus**

How would you solve this trig function: cos2x=sin^2-2 how do you know what trig identities to use?
*August 6, 2011*

**Precalculus**

Find cot x if sin x cot x csc x = .square root 2 After reducing i got cot= square root of 2 Am i correct?
*August 6, 2011*

**accounting**

A fleet of refrigerated delivery trucks is acquired on January 5, 2011, at a cost of $1,200,000 with an estimated useful life of eight years and an estimated salvage value of $100,000. Compute the depreciation expense for the first three years using the double-declining-...
*August 2, 2011*

**math**

d/dx x(1+y)^(1/2) + y(1+x)^(1/2)=0. Can some1 show me the calculation because i didnt get like the answer. [ans=-1/(1+x)^2 but my calculation=-(sqrt(y+1) (2 sqrt(x+1) sqrt(y+1)+y)/(sqrt(x+1) (2 sqrt(x+1) sqrt(y+1)+x)]
*July 22, 2011*

**calc 1**

Find the number c that satisfies the conclusion of the Mean Value Theorem. f(x)=x/(x+2) [1,4]
*July 5, 2011*

**physics**

i dont know
*June 29, 2011*

**government**

Each British colony was governed according to a _____, a written agreement between the settlers and the Crown laying down the colony's basic rules of government.
*June 16, 2011*

**Algebra**

find the vertex, line of symmetry, and minimum or maxium values of the quadratic equation f(x)=9-x^2
*June 15, 2011*

**calculus**

an object is dropped from a tower. the distance in t seconds is given by d(t)=4.9t^2 if the height of the tower is 146.9m , how fast is an object moving when it hits the ground??
*June 13, 2011*

**Random question**

Makee the world go awayyy do your remember when you loved meee... haha
*June 8, 2011*

**Random question**

thank you very much for your help
*June 8, 2011*

**Random question**

okay :/
*June 8, 2011*

**Random question**

Just doing a statistic here...can you name some of your favorite singers? Can be old or new.. Thanks!
*June 8, 2011*

**English**

From the depths of the ocean to the peaks of the mountains? does that make sense?
*June 8, 2011*

**English**

okay thanks!
*May 22, 2011*

**English**

When in disgrace with fortune and men's eyes I all alone beweep my outcast state, And trouble deaf heaven with my bootless cries, And look upon myself, and curse my fate, Wishing me like to one more rich in hope, [5] Featured like him, like him with friends possessed, ...
*May 22, 2011*

**English (poetry)**

But i thought personification is when something has human or animal characteristics?
*May 19, 2011*

**English (poetry)**

thanks! and is it in the last sentence "I hear it in the deep heart's core"?
*May 19, 2011*

**English (poetry)**

I will arise and go now, and go to Innisfree, And a small cabin build there, of clay and wattles made: Nine bean-rows will I have there, a hive for the honey-bee; And live alone in the bee-loud glade. And I shall have some peace there, for peace comes dropping slow, Dropping ...
*May 19, 2011*

**English (poetry)**

Thank you! :)
*May 19, 2011*

**English (poetry)**

IV His soul stretched tight across the skies That fade behind a city block, Or trampled by insistent feet At four and five and six o’clock; And short square fingers stuffing pipes, And evening newspapers, and eyes Assured of certain certainties, The conscience of a ...
*May 19, 2011*

**math**

24 divided by 4/5=??? I tried but i just could not get it.
*May 18, 2011*

**math**

9 divided by 1/6=??? I tried but I just couldn't get it!
*May 18, 2011*

**Math**

Find the sum: 7/12 + 7/10 =
*May 16, 2011*

**Algebra**

okay second onee.. 5x + 2y = 6 need to make y alone on the left side..so bring everything over to the right 2y=-5x+6 divide by 2 y=-5/2x +3 put that into calculator or graph it by hand... your y intercept is already given to you which is 3
*May 16, 2011*

**Algebra**

okay so heres what i got for the first one.. Triangle has to equal 180 degrees 1st angle= 2x-2 2nd angle= x 3rd angle= x+38 add them all together and equal it to 180 degrees in the end you would get 4x+36=180 solve for the equation and x is 36 now find the measure for each ...
*May 16, 2011*

**English**

Yes thats what i originally thought but my English teacher wrote this on my paper: If you were to need one you would write it like “Odysseus’”. When the word ends in an “s” you simply place the apostrophe after the ending “s”.
*May 13, 2011*

**English**

for the name Odysseus, if i want to add an s at the end do i have to write apostrophe before or after the s? Odysseus's family or Odysseus' family
*May 13, 2011*

**math**

convert 56.7 into degrees, minutes and seconds
*May 12, 2011*

**math**

convert 56.7 into degrees, minutes and seconds
*May 12, 2011*

**physics**

A mirror creates an image of magnification −1/3. (a) Is the image upright or inverted? (b) If the object is 7.75 cm tall, what is the height of the image? State your answer with the correct sign. answer to part B should be in cm. thanks.
*May 7, 2011*

**us history**

Passed in 1935, Roosevelt's most significant reform measure was the A. Wagner Act. B. Social Security Act. C. National Labor Relations Board. D. Fair Labor Standards Act.
*May 6, 2011*

**History**

Not true as in mind control is not a valid reason for cult conversion. Does that make more sense?
*May 5, 2011*

**History**

I was thinking maybe it could be something like this: While the effects of a cult are a matter of opinion, it is important to realize that "mind control" is more of an unclear and incorrectly named reason for cult conversion. I dont know if this makes sense or maybe ...
*May 5, 2011*

**History**

For my history class I have to do a research report about a social topic and I want to talk about cults. My teacher said to choose one and I chose Heaven's Gate. At first I was going to talk about the harmful effects of cults but after researching it, it was hard to find. ...
*May 5, 2011*

**Math**

A locker combination has three nonzero digits, and digits cannot be repeated. The first two digits are 1 and 2. What is the probability that the third digit is 3?
*May 3, 2011*

**Math**

You choose a head coach and an assistant from a group of 12 applicants. How many different groupings are possible? I know it is either 24 for a double combination of 12 - or I was thinking for number of possibilities it could be 12x11 = 132? Can anyone help me decide what is ...
*April 28, 2011*

**social**

advertise what? networking like facebook, myspace is a free way to adverstise, plus they have pay for add options. One can create their own website, is that kind of what you are asking?
*April 28, 2011*

**algebra**

I know it is either 24 for a double combination of 12 - or I was thinking for number of possibilities it could be 12x11 = 132? This is my daughters 7th grade homework, and I am stumped on helping her.
*April 27, 2011*

**algebra**

You choose a head coach and an assistant from a group of 12 applicants. How many different groupings are possible?
*April 27, 2011*

**Chemistry**

Calculate the sodium ion concentration when 70 ml of 3.M sodium carbonate is added to 30 ml of 1.M sodium bicarbonate.
*April 26, 2011*

**Science**

You have the same liquid it cannot change.
*April 26, 2011*

**Chemistry**

You forgot to enter any of your values... if you copied this from ALEKS it won't include them. You have to type them in.
*April 15, 2011*

**chemistry**

What would be the mass of a bag of anhydrous magnesium sulfate, MgSO4, if it contained the same amount of magnesium as a 1.00kg bag of Epsom salts, MgSO4 x 7H2O? Give your answer in grams. please help
*April 11, 2011*

**chemistry**

iron+sulphur together are a mixture of small grains yellow and dark grey.Its chemical symbol is 'Fe + S'.When it reacts with oxygen they create a new chemical substance; Iron Sulphide. What do you put for 'explain the reaction using the Big Idea of Energy? :S HELP xxx
*April 10, 2011*

**physics urgent!!!**

A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...
*April 7, 2011*

**physics**

A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...
*April 7, 2011*

**physics**

A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...
*April 6, 2011*

**Microbiology**

to solidify the media in order to obtain a pure colony
*April 6, 2011*

**english**

Which element of a short story would be most important to a story about a mad scientist stealing a secret weapon?
*April 6, 2011*

**Chemistry**

I have a question which asks... What is the Oxidation number of Nitrogen in Cu(NO3)2 I know the answer is 5+ but how do you get that?? Cu= 2+ O= 2- (Theres 3 of them so -2x3=-6...then, theres a two out of the brackets so 6- x 2 =-12) +2 - (-12)= -10? And then what? I think my ...
*April 6, 2011*

**Chemistry**

I have a question which asks... What is the Oxidation number of Nitrogen in Cu(NO3)2 I know the answer is 5+ but how do you get that?? Cu= 2+ O= 2- (Theres 3 of them so -2x3=-6...then, theres a two out of the brackets so 6- x 2 =-12) +2 - (-12)= -10? And then what? I think my ...
*April 6, 2011*

**Chemistry**

I have a question which asks... What is the Oxidation number of Nitrogen in Cu(NO3)2 I know the answer is 5+ but how do you get that?? Cu= 2+ O= 2- (Theres 3 of them so -2x3=-6...then, theres a two out of the brackets so 6- x 2 =-12) +2 - (-12)= -10? And then what? I think my ...
*April 6, 2011*

**8th grade science**

what contents in magma affects a volcanos explosive?
*March 28, 2011*

**physics**

at what altitude should a satellite be placed into circular orbit so that its orbital period is 48 hours? the mass of the earth is 5.976x10^24 kg and the radius of the eatrh is 6.378x10^6 m.
*March 23, 2011*

**physics**

a 1 kg mass is attached to a spring hanging vertically and hangs at rest in the equilibrium position. the spring constant of the spring is 1 n/cm. the mass is pulled downward 2 cm and released. what is the speed of the mass when it is 1 cm above the point from which it was ...
*March 23, 2011*

**History**

What aspects of Japanese culture were evident in samurai training?
*March 23, 2011*

**chemistry**

[h3o] = 1.78x10 ^-1 [OH] = 5.61x10^-3 pH= 11.75
*March 15, 2011*

**Science**

ANYONE?
*March 14, 2011*

**Science**

Sperm cells have very little cytoplasm, while egg cells have a lot of cytoplasm. How do these different structures support the different functions of eggs and sperm?
*March 14, 2011*

**Chemistry**

Can dimethylformamide be stored in plastic bottles? Or is it better to store in glass bottles?
*March 13, 2011*

**chemisty**

how many grams of magnesium sulfate are required to make 575 ml of a 1.65% (m/v) solution
*March 7, 2011*

**History**

How did Buddhism spread through Korea into Japan? Explain how Duddhism and Shinto blended together.
*March 7, 2011*

**History**

How would i word the answer though?
*March 7, 2011*

**History**

Where are China and Korea located in relationship to Japan? Why did this location allow for Japan to be influenced by many cultures at once?
*March 7, 2011*

**Science**

Does anyone have an answer?
*March 4, 2011*

**Science**

An animal has an allele for yellow eyes, but its eyes are grey. The allele for yellow eyes must be
*March 4, 2011*

**Science**

A person's height, eye color, and skin tone are all examples of?
*March 4, 2011*

**Math **

7 (x-2y) minus cubed
*March 2, 2011*

**Math**

Lisa bought two equal pieces of fabric. She will cut squares for a quilt from the fabric. All together Lisa bought 5 yards 1 foot of fabric. What is the length of each piece of fabric?
*February 24, 2011*

**Math**

I have 5 books. Each book weighs 1 kilogram 250 grams. How much is the total weight?
*February 24, 2011*

**math**

A rectangle has a perimeter of 24 and an area of 35 square feet. What is the length and width of the rectangle?
*February 23, 2011*

**chemistry**

How do you find Kc for an equilibrium problem?
*February 20, 2011*

**Chemistry**

what is an example of a substance that has both ionic &covalent bonds & where are these bonds formed.
*February 13, 2011*

**chemistry**

I keep thinking that 3 is the van't hoff factor for ammonium chloride, but I keep getting my answer wrong. Any ideas?
*February 11, 2011*

**math**

what percent of 1/4 is 2/5
*February 10, 2011*

**Accounting ethics**

I got some help to get started but the material still seems like a foreign language. Someone layed out a nice outline for me to follow, but without understanding the material I still can't get anywhere. It is how to CONDUCT a stakeholder analysis I am stuck on. The few ...
*February 4, 2011*

**sociology**

i have the same question that link doesn't help at all.
*January 28, 2011*

**physics**

During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 1.10 108 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the electron moves from the...
*January 18, 2011*

**Chemistry**

How many moles of HCl are present in a 50mL 3M solution of HCl?
*January 12, 2011*

**Chemistry**

How many moles of HCl are present in a 50mL 3M solution of HCl?
*January 12, 2011*

**chemistry**

if 5liters of hydrogen iodide gas is bubbled through 2 liters of 0.0275 M lead 2 nitrate solution at STP, how many grams of lead 2 iodide will precipitate out?
*January 6, 2011*

**math**

The points A (7,6) and B (2,1) are 3 units and 2 units respectively from the line L and are on the opposite sides of L. Find the coordinates of the point where the interval AB crosses the line L.
*January 6, 2011*

**math**

add
*January 6, 2011*

**social studies**

about how many peole went through ellis island?
*January 5, 2011*

**8th grade science**

when you bring your bicycle to a stop where does he kinetic energy it had go?
*January 4, 2011*

**8th grade science**

compare and contrast the effect of a catalyst on a chemical reaction with that of an inhibitor?
*December 21, 2010*