# Posts by Andrew

Total # Posts: 1,174

**electrochemistry**

What is the anode and cathode of this problem? A chemist wishes to determine the concentration of CrO4-2 ions electrochemically. A cell is constructed consisting of saturated calomel electrode (SCE) and a silver wire coated with Ag2CrO4. The SCE is composed of mercury in ...

**chemistry**

which orbitals in the molecular orbital diagram contain the lone pair electrons around O? My answer: one of the lone pairs on oxygen exist in an "s" orbital. two of the lone pairs exist in "p" orbitals not involved in bonding. -is this correct.

**Statistics**

In a certain microwave oven on the high power setting, the time it takes a randomly chosen kernel of popcorn to pop is normally distributed with a mean of 140 seconds and a standard deviation of 25 seconds. What percentage of the kernels will fail to pop if the popcorn is ...

**PLEASE SOMEBODY Answer this Statistics question!**

The local lottery sets up a game wherein a player has a chance of collecting $750. The player must choose a 3-digit number and if it matches, the player receives $750 It costs $1 to play the game. What is the expected profit (or loss) for each player.

**Stats**

The local lottery sets up a game wherein a player has a chance of collecting $750. The player must choose a 3-digit number and if it matches, the player receives $750 It costs $1 to play the game. What is the expected profit (or loss) for each player. PLEASE ANSWER ASAP...

**Statistics**

The local lottery sets up a game wherein a player has a chance of collecting $750. The player must choose a 3-digit number and if it matches, the player receives $750 It costs $1 to play the game. What is the expected profit (or loss) for each player.

**Statistics**

Use the standard normal distribution to find P(-2.25 < z < 1.25).

**Math Help Needed**

I need to figure out a pattern (using an algebraic expression) that will get me from: 1 to .01, 2 to .02, 3 to .04, 4 to .08, etc. all the way to 25 to 153,948.16! HELP

**Math**

I need to figure out a pattern (using an algebraic expression) that will get me from: 1 to .01, 2 to .02, 3 to .04, 4 to .08, etc. all the way to 25 to 153,948.16! HELP

**College Calculus (Binomial Series)**

Expand f(x) = (x+x^2)/((1-x)^3) as a power series and use it to find the sum of series (SUM from n=1 to infinity) (n^2)/(2^n) PLEASE HELP.

**physics**

dont know if its correct but its something. p=w/t W=KE=(1/2)m(v)^2 p=(.5mv^2)/t p_inital=(.5(1600)(19.5))/11=27654watts p_final=(.5(1600)(3.2))/11=744.7...watts (p_final)-(p_inital)=26909.27...watts maybe? idk

**Chemistry**

When installed in the year 1,985, a cobalt-60 radiation therapy source (k = 0.131 yr-1) produced a beam capable of delivering 323 rem per minute (a unit to describe the beam intensity). What is the beam intensity (in rem/min) in the year 2007?

**language arts**

Which of the following sentences has a dangling modifier? A. On the way to the bank, the interest rates went down. B. By the light of the moon, I tripped over a rock. C. The dog that is man's best friend is cat's worst enemy. D. When the storm began to abate, we went ...

**college calculus**

evaulate an intergral for length of curve with y=(sqrt(4-x^2)) and 0 <_ x <_ 2 im lost, i think i know how to apply the formula but its so difficult to integrate and i need to show all my work!

**Chemistry**

What is the molarity of the resulting saline solution when you mix 1 mole HCl with 1 mole NaOH? I'll provide some basic information that I know, but could somebody tell me how to get the answer using the data? The balanced reaction is as follows: HCl+NaOH->H2O+NaCl ...

**Algebraic Functions**

but guido, if that is your real name, wait a sec how do u divide a trinomial by a binomial

**math**

I need help with my homework

**statistics**

For a sample with a mean of M=85, a score of X=90 corresponds to a z-score of z=1.00. What is the sample standard deviation?

**physical education**

what exercise is done to strenghten the gastronemuis? is it toe raies?

**For DrBob222**

I'm not surprised the answer was wrong. Chemical reactions are by mols and not by grams; therefore, 1 mol of each reactant produces 1 mol of each product but a mol is not a gram. SO, convert 0.5839 g KHC2O4 to mols, convert mols KHC2O4 to mols KOH (that's the 1:1 part...

**Chemistry**

A sample of KHC2O4 weighing 0.5839 g is dissolved in 25 mL of water and an endpoint is reached when 31.99 mL of KOH has been added. Calculate the molarity of the KOH solution. KHC2O4(aq) + KOH(aq) ¨ K2C2O4(aq) + H2O(l) because the coefficents are all the same, i just...

**Chemistry**

Hydrogen cyanide is a weak acid with Ka = 4.9 x 10-10. Calculate the pH of a solution (to 2 decimal places) containing 2.28 g of Sr(CN)2 per 158 mL.

**math**

thank you very much! your info was very helpful!

**math**

which is the smallest unit of measurement? m, cs, km?

**math**

why is it good to play cards in a grave yard

**geometry**

a right traingle has legs of lengths 3 centimeters and 5 centimeters. Use the pythagorean theorem to find the area of a square drwan on the hypotenuse of the triangle.

**Chemistry**

Can someone tell me why N2^2+ is a diamagnetic molecule based on MO theory and diagrams? I get a bond order of 2, which is paramagnetic.

**Chemistry**

Calculate the mass in g of aniline (C6H5NH2, Kb = 4.3 x 10-10) that must be added to 1.4 x 102 mL of 0.24 M (C6H5NH3)Cl solution in order to generate a buffer solution of pH 5.56. Give your answer to 2 significant figures. Noclue...

**Chemistry**

Determine the pH of a solution that is prepared by mixing 100.0 mL of 0.125 M NaOH with 145 mL of 0.125 M CH3COOH (pKa = 4.75). Report your answer to 2 decimal places. Please help, I have no clue!!

**Chemistry**

how would i find the pH of this? 1.0 M NH3 (Kb = 1.8 x 10-5)

**math**

find each product,5/11x2/7 = or 2/9x4/8=

**homework help**

Hi, can you help me with my homework?

**Science**

Ok so I have to use kinematic equations to solve these. But I make like a X and Y chart Ex...X|Vix=2.89 dx=? t=? Y|Viy=0 dy=3.7 and so forth. 1. A cliff diver strikes the water 10.3 meters from a cliff 25 meteres high. At what horizontal speed did he leave the cliff? 2. A ball...

**social studies**

How do you learn about people who lived long ago?

**math-algebra**

the answer Red then blue the red is D. 1 of 38 or 2.63% chance 5 red chances /20 balls * 9 blue /19 * 4 red balls left /18 = .25 X .47368 * .2222 = .0263 or 1/38

**english**

i need about song reponse

**Physics**

15.6

**Physics 221**

1 = A

**Fashion Design**

What is the Number one and two mostly used art programs by fashion designers? after making the drawings in these art programs, how do the freelancers get their designs onto different clothing and material and mass produce it.. What are the steps that are usually taken. Here is...

**physics- density**

An air mattress is 2.1 m long, 0.55 m wide, and 13 cm deep. If the air mattress itself has a mass of 0.22 kg, what is the maximum mass it can support in fresh water? I know that I can find the volume and area, and the density of water. But I cannot find an equation to find the...

**Research Paper: jack london/call of the wild**

Hi. I need some good sources to use. Lots of them. I'll explain I need to write a 6 page research paper on Jack London and the book "The Call of the Wild" (yes both), using only things told to me from sources. Here's another thing: I can't plagiarize any ...

**Spanish**

Our teacher gave us this quote "the one who got away" and we are supposed to figure out what it means. If anyone in the class does the entire class gets to go to our local Mexican restaurant for lunch!! Please help! It is pretty obvious what it means, in English. It ...

**social studies**

how do you write an advertisment about academics, respect,teamwork and leadership Depends on what kind of ad it is. If it's a print ad, you probably want an image that brings a lot of those ideas together with few words. If it's a radio or television ad, you have about...

**Sports**

Good website on Pat Tillman. Know doing on Pat instead of football. http://en.wikipedia.org/wiki/Pat_Tillman If this is a report for school, here are some suggested topics: The use of illegal drugs in professional sports. The effect of sports finances on Universities The ...

**Sports**

Can you name the six quarterbacks taken in the first round of the 1983 NFL draft and the order in which they were selected? We are a homework help service, helping students who are stuck with homework. If this is homework,I recommend you get your parents involved and change ...

**Spanish Essay: Looking for Corrections**

Hello. Just wondering if anyone could look this over for me and make any corrections. It'd be really appreciated. I've never been a good writer in Spanish, and it's this once-a-quarter essay projects that cause me trouble. Thanks in advance for any help! Gracias...

**Math Help Please**

The concentric circles, or growth rings, represent the cross-section of a tree with a diameter of 16 centimeters. The width of the outer tree ring measures 2 centimeters. What is the area in square centimeters of the outer ring of the cross-section of the tree? Use 3.14 for p....

**Math Help Please**

The concentric circles, or growth rings, represent the cross-section of a tree with a diameter of 16 centimeters. The width of the outer tree ring measures 2 centimeters. What is the area in square centimeters of the outer ring of the cross-section of the tree? Use 3.14 for p....

**Health Project Ideas**

yall are So helpful..

**Manuscript Speech**

How do I write a Manuscript speech on an article? What should it look like? Any examples? Check this site for a lot of information about writing a manuscript speech. http://www.shkaminski.com/Classes/Handouts/ms_spch.htm Thank you for using the Jiskha Homework Help Forum again...

**MANUSCRIPT! BOBPURSLEY PLEASE!!**

PLEASE FINISH HELPING ME.. I asked experts to answer you. I am not a person who is a expert on writing format. The issue of cover sheet, etc has to be clarified by the teacher. Generally, teachers specify a style guide and format issues. There is no right answer to these ...

**Manuscript on an Article (bobpursley)**

Posted by bobpursley on Saturday, January 27, 2007 at 8:56pm in response to English (Speech). Read the article. What did it say? What was it point of view? Was the author complete in the analysis? What needs to be done? How did it make you feel? So in the paper, describe the ...

**English (Speech)**

I have to write a manuscript on an article. How do I do this. I looked online, and I found this " Each manuscript should contain a separate cover sheet with the manuscript title, the authors’ names, their degrees, affiliations and complete mailing addresses and phone...

**English (Speech)**

I was told to write a Manuscript on an article. How exactly do I write this thing? how do i get started? Can someone please provide me with an example. Read the article. What did it say? What was it point of view? Was the author complete in the analysis? What needs to be done...

**antiderivatives**

i need the antiderivative of 2x/x^2 thanks. Two x over x squared? Reduce it to 2/x the integral of 1/x is ln x.

**antiderivatives**

i need the antiderivative of sinxcosx dx for intergral pie/2 to 0 thanks. sin(x)cos(x)dx = sin(x)d[sin(x)] = 1/2d[sin^2(x)]

**Biology**

What is an example of asexual reproduction in a plant? http://en.wikipedia.org/wiki/Vegetative_reproduction

**Spanish - Need Essay Corrected Please!**

Hello everyone. I recently had to write a short essay for spanish for my quaterly project. I was wondering if anyone could check it over for me and point me out to any corrections I need to make. It'd be greatly appreciated for your help. Below is my spanish version and ...

**ap chem**

1x10^-6 divided by 6.02x10^23 equals 6.02x10^17 1.25x10^20 divided by 6.02x10^23 equals 2.08x10^-4

**Precalculus**

i need to show that the given equation is an identity. using composite argument properties. (cosAcosB-sinAsinb)^2 + (sinAcosB+cosAsinB)^2 = 1 Composite argument properties: cos(A + B) = cosAcosB - sinAsinB sin(A + B) = sinAcosB + cosAsinB Substituting: [cos(A + B)]^2 + [sin(A...

**Economics**

The table below shows annual demand (in 1,000,000 units per year) for Widgets. Use this information to calculate a constant growth forecasting model. Use your growth model to forecast demand for the years 1995 and 2000. Year Demand 1990 1.1 1991 1.5 1992 1.5 1993 1.8 All help ...

**Microeconomics**

1. The utility function is given by: U=x+y and the budget line is x+2y=100. Then the price of good x goes up to 4. Find the Hicksian substitution effect, income effect, and total change in demand for good x from the change --- Ok i read the theory but i cant solve the problem ...

**computers**

how do I tell the main difference between simm and dimm in electronic and physical? Also I don't know the question of "explain an upgrade to a Compaq R4000 computer to the maximum amount of memory. It currently contains two 512M modules."

**math - probability**

Imagine a LONG bike with a total of 4 wheels - 2 in the front and 2 in the back. For the bike to work at all, at least 1 front wheel and 1 back wheel must be operational. All 4 tires are the same and each, individually, has probability 'p' of failing. What is the ...

**Spanish - Need paper proofread asap!**

Hello everyone. I'm new to this board, found it on google when trying to find someplace to have someone look over my paper. I'm in my last year of spanish at high school, but I haven't done much writing in Spanish over the past few years (and I'm not that great...

**science**

I have to make a 3-d model of a hurricane. Does anyone have any suggestions for how I can do this? The materials to use, etc? an easy thing to use is cotton balls, pained dark. To get a good picture, use google images, or some other image gallery. the never ending series of ...

**Calculus - Tangent Line**

Hi, im having problems with the following problem. The main issue is actually starting the problem. Find the two points on the curve y = x^4 - 2x^2 - x that have a common tangent line. First, find the derivative of y(x) so that you know the slope of the tangent line at any ...

**someone explain to me!**

the third term of a geometric sequence is t3= -75 and the sixth term is t6=9375. determine the first term and the common ratio. how do I do this question I am tying really hard but I still don't comprehend this question! We have t3 = -75 and t6 = 9375. A geometric sequence...

**Science**

Cell Theory

**Chemistry**

Consider a solution containing 37.0 (+/- 5)% (wt/wt) HCL in water. The density of the solution is 1.18 (+/- 0.01) g/mL. To deliver 0.0500 (+/- 3%)mol of HCL requires 4.18 (+/- x) mL of solution. Find x. My teacher said x= .4. How do you solve for uncertainty? http://www.rit....

**Intro to Physical Science**

Define physical science Andrew: I went to www.dictionary.com and typed in physical science. The following is what it returned.I hope this helps. physical science 1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and ...

**social studies(microeconomics)**

which economic type(market,traditional, or command economy) is the most efficient and which is the most equitable? Please explain why. These sites briefly explain these economic types. http://www.missouri.edu/~cee/Grades/ceehs36.html http://regentsprep.org/Regents/global/...

**chemistry ugg!**

what is the age of a rock whose Argon 40 / Potassium 40 ratio is 1.55? The half life of Potassium 40 is 1.28 x 10^9 years I am confused on this question theres no examples in my book but i have to know it can someone explain to me how to get to the answer? You don't say if...

**unscrambling word**

first word has 5 letters second word has 10 letters deals with artist i think letters are mtvheepsirtaiss