Wednesday

September 28, 2016
Total # Posts: 64

**Maths (Coordinate Geometry)**

A point P(x,y) moves so that the line joining P to A(9,-5) is perpendicular to B(4,5). Derive an equation specifying the locus of P.

*May 8, 2016*

**Chemistry**

P4 (g) + 3O2 (g) <-> P4O6(s) At a particular temperature, Keq = 4.6. If [P4O6] at this temperature is 1.2M, calculate the concentration of P4 and O2 I'd rather have someone tell me how to do it, so I can do it myself since it's in preparation for an exam.

*November 19, 2015*

**History**

were there any similarities between the roman emperors nero and caligula, and the roman general mark antony?

*November 18, 2015*

**physics**

At what force would a 16k object travelling at 25mph hit a stationery object

*March 6, 2015*

**Math**

Whats my rule Input 140. Output. 22 Input 100. Output. 62 Input. 91. Output. 71 So if the input is 10 what is the output?

*May 13, 2014*

**Math**

Jean has a total of 24 coins consisting of just quarters and nickels. The coins total $3.40. How many of them are quarters?

*December 9, 2013*

**math**

Given: f(closure(A)) subset of closure(f(A)) Prove: For any closed set A in Y, f^-1(A) is closed in X (AKA f is continuous) X and Y are metric spaces f: X -> Y f^-1 is f inverse. closure(A) = A U limit points of A The first line is Let C be a closed subset of Y. Then we ...

*April 14, 2013*

**Biochemistry**

Preform dilution calculations for 10 ml of 2 M stock solution. Molecular weight for the component is 48.6 g / mol

*March 3, 2013*

**maths**

3. Suppose that a particle moves in a plane with trajectory given by the polar equation r=2bsintheta for some constant b > 0.Show that this can be written in Cartesian coordinates as,x^2 + (y-b)^2 = b^2;This is the equation for a circle of centre (0; b) and radius b. ...

*February 20, 2013*

**maths**

Steve

*October 31, 2012*

**maths**

its 7^n+4^n+1

*October 31, 2012*

**maths**

prove by mathematical induction that 7n+4n+1 is divisible by 6

*October 31, 2012*

**chemistry**

calculate the mass of iron in 2.5000g of feric nitrate nonahydrate Fe(NO3)3.9H2O

*February 4, 2012*

**chemistry **

Calculate the concentration of nitrate ions, NO3- , in mol dm-3, of a solution made by dissolving 2.5000 g of ferric nitrate nonahydrate in water to give 2.000 L of solution.

*January 30, 2012*

**medical billing**

I did using my materials but I get comfuse do I code twice.

*December 4, 2011*

**medical billing**

help ...Pt present for suture removal. sutures removed and slight oozing occurs in midsection of wound. wound dressed and pt advised to aply antibaterial cream daily. retn in 4 to 5 days for final check(PF HX/PX SF/MDM...what is the code

*December 4, 2011*

**Medical billing **

2nd question, pt present for PO check of head wound Pariental area healed well. RTO prn ( pf hx/px/sf/mdm) what is the code...

*December 4, 2011*

**Medical billing**

Pt present for suture removal. sutures removed and slight oozing occurs in midsection of wound. wound dressed and pt advised to aply antibaterial cream daily. retn in 4 to 5 days for final check(PF HX/PX SF/MDM...WHAT IS THE OV

*December 4, 2011*

**cook**

I beieve is Gumbo

*December 4, 2011*

**earth**

sam weighs 720N on the earth and 120N on the moon.what does this tell you about the value of gravity on the moon?

*November 6, 2011*

**music **

for my music homework i have to do a poster on mozarts minuets and i dont know anything about him .please help!!!!!!!!!!!!!

*June 28, 2011*

**MATH**

is there anyway that a diagram or something can be drawn or pasted into the question box for a math problem?

*March 6, 2011*

**Geometry**

Reiny?

*March 6, 2011*

**Geometry**

The shaded region is between IKD THere are to lnes opposite of each other. Then to parallel lines through those lines. Thers is a circle in the middle with a circumference of 20 pi. THen there is a triangle that connected to the outer lines to the right. the measure of the ...

*March 6, 2011*

**Geometry**

Given circle A with circumference 20 pi and the length of arc KD equal to 10/3 pi. Find the area of the shaded region. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Is there any ...

*March 6, 2011*

**chemistry**

Molarity = moles/volume (dm3) so you need to convert your volume into dm3. 1dm3 = 1000ml so your equation should be; molarity = 0.56/0.100 = 5.6moldm-3

*February 8, 2011*

**chem**

Not sure about the KBr and the sand but iron is magnetic so that can be removed with a magnet. Sorry I cannot answer fully.

*February 8, 2011*

**chemistry**

standard enthalpies of formation H20(l) = -286 LiOH(s) = -487 standard enthalpies of solution for LiOH(s) to split into it's ions is 21 all values are in KJmol-1 Use the data given to calculate a value for the enthalpy change for the reaction of lithium with water. I get ...

*February 8, 2011*

**Chemistry**

The first step would be to calculate the MR's of each substance so you could get the reacting masses so: 3H2 = (3 x 2 x 1) = 6 N2 = 14 x 2 = 28 2NH3 = (2 x 14) + (2 x 3 x 1) = 34 so in theory you need 6litres of H2 and 28litres of N2 to produce 34litres of NH3. Is the ...

*February 8, 2011*

**Chemistry**

first of all you would need to find out the number of moles in solution using moles = mass/Mr Mr of AgNO3 = 108+14+(16x3) = 170 moles = 1.70g/170 = 0.01 Then you can use the formula: concentration = moles/volume(dm3) = 0.01/0.250 = 0.04moldm-3 hope this helps

*February 8, 2011*

**chemistry**

You need to know the formula for silver nitrate which is AgNO3 Then you work out the MR of silver nitrate = 108+14+(16x3) = 170 Then you work out the MR of the nitrogen contained in silver nitrate. There is just one nitrogen atom so it would be 14. Then you need to work out ...

*February 8, 2011*

**chemistry**

Use the formula moles = mass/Mr Mr of sodium = 23 Rearrange the equation to make mass the subject. mass = moles x Mr and put in the numbers... mass = 2 x 23 = 46g Hope this helps

*February 8, 2011*

**Chemistry**

Electrostatic bonding forces relates to covalent compounds and the shared pair of electrons, it is when the nucleus of one atom attracts the electron of another atom and the electrons become shared between the two atoms. All you need to do now is pick out the covalent ...

*February 8, 2011*

**Chemistry**

A biomass power station burns forestry residue which has 2000 ppm potassium in it and produces 2% ash by weight (think Ive worded that right). I need to find the fraction of K2O in the ash, but only the fraction of K in the fuel as a whole is given.

*February 7, 2011*

**Art**

I need to know about the symbolism in Olympia, can you explain what this means please.

*January 16, 2011*

**Chemistry**

A student completes a titration by adding 12.0 milliliters of NaOH(aq) of unknown concentration to 16.0 milliliters of 0.15 M HCl(aq). What is the molar concentration of the NaOH(aq)?

*April 13, 2010*

**Medical Billing**

diagnose is 681.11 E/M 99202, I&D great toe 10060 modifier TA, Excision great toe 11750 modifier TA, and 99024 PO check..

*March 29, 2010*

**hospitality **

give 2 legal obilgations of manufacurers and employers with regards to cleaning agents

*February 17, 2010*

**English**

Do you hyphenate 3D or leave it one word?

*October 17, 2009*

**Algebra**

What is the length of the hypotenuse of a right triangle with legs of 5 and 12 units? What is the "hypotenuse" and "legs" of a triangle? Thanks!

*May 30, 2009*

**Algebra**

Do you know a site with some practice problems for a quadratic formula (ax^2 + bx + c) for my test tomorrow? Thank you so much!

*May 28, 2009*

**Algebra**

A turbo-jet flies 50 mph faster than a super-prop plane. If a turbo-jet goes 2000 miles in 3 hours less time than it takes the super-prop to go 2800 miles, find the speed of each plane. I do not understand how to do this at all. Please explain as well as you can! Thanks.

*May 24, 2009*

**Algebra-- PLEASE help!**

(x+3/4)^2 = 17/16 My teacher taught us a square root method, but I am confused with it on this one! I would prefer if you show me using square roots, but if you have another way, please help too! Thank you!

*May 12, 2009*

**Thanks!**

Thank you for your help!

*January 24, 2009*

**algebra**

Mandi can be paid in one of two ways: Plan A-- A salary of $400 per month, plus a commission of 8% gross sales; or Plan B-- A salary of $610 per month, plus a commission of 5% of gross sales. For what amount of gross sales should Mandi select Plan A? I have no idea how to ...

*January 24, 2009*

**Algebra**

A long-distance call using DEC costs 20 cents for the first minute and 16 cents for each additional minute. The same call, placed on LCS, costs 19 cents for the first minute and 18 cents for each additional minute. For what length of phone calls is DEC less expensive? Here'...

*January 24, 2009*

**art**

where does banksy come from

*October 15, 2008*

**re**

for my re homework i need to find 3 pieces of evidence of what jesus did and 3 pieces of evidence what jesus didn`t do . i only need a little bit of info not pages of it. thanks!

*September 22, 2008*

**earth's systems**

What are the four earth systems? and how do they interact with eachother? Lithosphere, Biosphere, Atmosphere, and Hydrosphere. They operate in an integrated fashion. I recommend you cite some specific interactions. all of the systems work together by air masses

*April 10, 2007*

**science**

Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) state the differences in the product cells at telophase II if a crossing over had...

*April 10, 2007*

**Biology, please help**

Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) state the differences in the product cells at telophase II if a crossing over had...

*April 10, 2007*

**Biology**

what differences would there be in the product cells at telephose II of meiosis if there had been one crossing over at a position halfway between the Huntington disease gene and the centromere.

*April 10, 2007*

**science**

I am writing an essay on the subject of, 'The metabolism of green plant cells in relation to energy exchange process.' Can anyone advise of key ideas to include please? This is a very, very complicated subject. Look here: http://en.wikipedia.org/wiki/Metabolism Notice ...

*April 9, 2007*

**science**

what is the meaning of a glycosidic C-1 to C-4 linkage? Since this is not my area of expertise, I searched Google under the key words "glycosidic C-1 to C-4 linkage" to get these possible sources: http://scholar.google.com/scholar?q=glycosidic+C-1+to+C-4+linkage&hl=...

*March 18, 2007*

**science**

When an acid and an alcohol react does it produce an ester? If so ehat type of reaction is this? I call it esterification. It is also an elimination reaction in that water is eliminated.

*March 12, 2007*

**Chemistry**

what is the pH of Sulphuric acid? It depends upon the molarity. pH = -log(H+) -log = ? pH = -log(H^+) find (H^+), punch that into your calculator, change the sign to minus, then find the "log" key and punch that. That will be the pH.

*March 12, 2007*

**Science**

which action would result in the more (financially) valuable product: taking one proton from each nucleus in a sample of gold or adding one proton to each gold nucleus? Taking a proton (p) away 79 AU - 1p = atomic number 78?? Adding a Proton Au79 + 1p = ??80 Which is more ...

*March 12, 2007*

**To Adam/Anthony/Hols**

Any help with s103 06 QUESTION 5?? You would do better, I think, to post your question and let everyone try to help rather than using only students taking the course.

*March 12, 2007*

**science**

A 0.21 g of Sulfuris acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration (in mol 1 -1) in this solution. Give your answer in scientific notation to an appropriate number of significant figures. ...

*March 6, 2007*

**Chemistry**

suppose that ununhexium undergoes a succession of a-decays reactions. What isotype would be the final product? how did you arrive at this answer? and is it a lanthanide, actinide, transition or typical element? See the post above as a response to bertie. All neat even with ...

*February 6, 2007*

**cHEMISTRY**

GIVE THE EMPIRICAL FORMULAE OF THE HIGHEST HYDRIDE AND HIGHEST FLUORIDE OF UNUNHEXIUM, EXPLAINING HOW YOU ARRIVED AT YOUR CONCLUSIONS Here is the web site for a very good periodic table. Look for element #116, Uuh. Elements in the periodic table have similar chemical ...

*February 6, 2007*

**Chemistry**

I know that Ununhexium is in period 7, group 16. What evidence would be able to support this? Here is a web site for an on-line periodic table. Look for Uun, element #116. That will give you the info you need. http://www.webelements.com/

*February 6, 2007*

**chemistry**

Is melting endothermic or exothermic? Things that are melting are taking on heat, endothermic Would freezing be the same? No, of course not. If melting is endothermic, then freezing must be exothermic. Believe it or not, and I know it sounds goofy, freezing water to ice is an ...

*November 5, 2006*

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