Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 1,648

**algebra II**

sorry for calling it an equation i mean i have to simplify the expression

**algebra II**

need help solving the equation 5y-14+7y-20y

**Math**

Kim is twice the age of Ryan. In 4 years Kim will be 7 years older than Ryan. How old is Kim now?

**chemistry**

793.4 g

**chemistry**

a brain weighing 1.0 Ib occupies a volume of 620 ml. What is the specific gravity of the brain?

**Algebra**

A moving Company weighs 20 boxes you have packed that contain either books or clothes and says the total weight is 404 pounds. You know that a box of books weighs 40 pounds and a box of clothes weighs 7 pounds. Find how many boxes of books and how many boxes of clothes you pac...

**Chemistry**

An alpha particle (mass = 6.6 10-24 g) emitted by radium travels at 2.5 107 ± 0.1 107 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) What is the uncertainty in its position?

**algebra 1**

how to simplify and solve 2/5(20x+5)-1/2(8-4x)=38

**math**

Sam ran between 8 and 15 miles a week for 5 weeks.About how many miles could he have run?

**ALL OF JISHKA STAFF**

Hello I had a couple of questions and was woundering if you have staff members that are teaching or have taught AP BIOLOGY AP PHYSICS B AP CALCULUS AB AP CHEMISTRY I was told that the AP BIOLOGY teacher had gotten extremly ill =(, has he come back? Also can you tell me if you ...

**English (Biology Essay)**

I know my english is crap any corrections suggestions cirtisims etc. would greatly be apreciated... if you know any biology and find anything that is biologically wrong that would be great as well but don't worry if you don't THANK YOU!!! im putting my initals just in ...

**Physics**

Convert 5:25:25 to seconds.

**Algebra**

Available evidence suggests that about 20 percent of the asteroid’s mass turned to dust and spread uniformly over Earth after eventually settling out of the upper atmosphere. This dust amounted to about 0.02 g/cm^2 of Earth’s surface. The asteroid very likely had a d...

**Calculus**

dont worry about it i think i'm gettin g some where

**Calculus**

actually cos(x)=-2 has an infinte amount of solutions so to say it dosen't have ONE is just wrong... but yah I don't buy that the equation, in some post below doesn't have critical points they are defined I found them, but whatever anyways can you help me simplify ...

**Calculus**

same as my question below please help me post your answer on here if you have one on these forms of course h t t p : / / w w w . p h y s i c s f o r u m s . c o m / s h o w t h r e a d . p h p ? t = 4 2 1 7 6 3

**Calculus**

no one on physics forums seems to know the answer so I was wondering if you guys could help post anser on these forms of course if you can help my question is here h t t p : / / w w w . p h y s i c s f o r u m s . c o m / s h o w t h r e a d . p h p ? t = 4 2 1 7 5 8

**Chemistry**

For many years the recovery of gold-that is, the seperation of gold from other materials-involved the use of potassium cyanide: 4AU + 8KCN + 02 +2H20 -> 4KAu(CN)2 + 4KOH What is the minimum amount of KCN in moles needed to extract 29.0 g (about an ounce) of gold? Now my que...

**physics**

And it's around 16.4 -- I just can't get it to the exact value that the Webassign will accept. Thank you again!

**physics**

They are connected by a string -- unfortunately I am unable to link the diagram. I believe that for the purpose of the problem they are ideal strings.

**physics**

In the figure we see two blocks connected by a string and tied to a wall, with theta = 33°. The mass of the lower block is m = 1.0 kg; the mass of the upper block is 2.0 kg. The tension of the string connecting the blocks is 5.337. Find the tension in the string that is ti...

**Algebra I**

Rectangle ABCD has vertices C and d on the x-axis and vertices A and B on part of the parabola y = 9 - x^2 that is above the x-axis. a.) Find the coordinates of A, B, C, and D in terms of x. b.) Determine the Area of the rectangle as a function of x. c.) What is the domain for...

**Math**

x +/- 3 is that mroe simplified then writing it out x + 3, x - 3 I thought it would be becaue we normally say simple is when all of the operations that could be done is done in which case the second choice is more simple? I'm just woundering because i'm doing a summer ...

**Calc**

I'm trying to write an equation for all the infinite values of the equation -i ln(2 + sqrt(3) ) people have told me that its pi(2n + 1) -i ln(2 + sqrt(3) ) I don't see how so I plug in numbers for n and don't get the same answer usign my calculator please explain w...

**CALC**

1. The problem statement, all variables and given/known data cos(x) = -2 I was trying to solve that problem ignoring what people say about it not being defined and got a number strangely. I showed step by step so you can tell me what I did wrong as I don't think I did anyt...

**Calc**

1. The problem statement, all variables and given/known data cos(x) = -2 I was trying to solve that problem ignoring what people say about it not being defined and got a number strangely. I showed step by step so you can tell me what I did wrong as I don't think I did anyt...

**Algebra**

Having some trouble graphing this y = 3 - x for x less then or equal to 1 y = 2x for x greater than one how do I indicate that for the first part (1, 2) there would be a closed point at that cordinate but for the second part an open point at those same exact cordinates how do ...

**Algebra**

(60 + 16sqrt(15))/(60 + 17sqrt(15)) i tried dividing but got stuck thanks

**Calculus**

Find the range of y = (3x-1)/(2x^2 + x - 6) I was going to take the derivative of the numerator and denomenator and then use the quotent rule to find the derivative of the function and find the critical values but I ran into the imaginary number during the proess and am wounde...

**Calc I**

Find the range of y = (3x-1)/(2x^2 + x - 6) I was going to take the derivative of the numerator and denomenator and then use the quotent rule to find the derivative of the function and find the critical values but I ran into the imaginary number during the proess and am wounde...

**Math (Very Easy Math)**

I'm kind of confused as to what simplified mean? Can you please provide me with a definiton... Like I'm kind of stumped as to what one is more simplified -7(2x + 3) or -14x -21 Please explain what it mean for an expression to be "simplified"

**Calc I**

Solved

**Calc I**

Yes I was trying to find the range y = (x^2 -4)/(x^2 - x -12) ok using 2(4 +/- sqrt(15) ) sorry I forgot the minus in the derivitive but ya that makes sense but however I need three critical values that only gives me graph it and you'll see there are three how do I find th...

**Calc I**

y = (x^2 -4)/(x^2 - x -12) dy/dx of numerator I got 2x dy/dx of denomenator I got 2x - 1 dy/dx of y I got (x^2 - 16x -4)/((x-4)^2(x+3)^2) setting numerator to zero and solving got 8 +/- sqrt(65) with the critical value being the + setting denomenator to zero and solving got 4 ...

**Algebra I**

I'm stuck on this problem please help me find the range of this equation y = (x^2 - 4)/(x^2 - x - 12) I know that it is [1/3,-infintiy]U[?,infinity] yes I'm having trouble with that ? At first I was like ok there should be a horizontal asymptote at y=1 there is in calc...

**Algebra I**

Ok so I kind of forgot how to do this so I looked up on the internet and was told divide the coefficent in the numerator of the highest degree by the highest coeficent of the highest degree in the numerator and that should be your horizontal asymptote one problem f(x) = (x^2 -...

**Algebra I**

nevermind

**BobPursley**

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 9 9 0 5 6 1 4 well it's on this page just CTRL+F Kate you can post here if you want thanks!

**algebra**

Use the quadratic formula (40 +/- sqrt((-40)^2 - 4(-6)(-50) ))/(2(-6)) what ever that comes out to be

**Trig**

I thought that this was already in radians by the way... ln( (4i +3)/5)/i why is it not considered to be in radians?

**RESPONSE**

My instructions were just to "Evaluate" why is that not considered an angle?

**Trig**

I was doing this problem sin^-1 (4/5) if I'm not mistaking most teachers would say that .927295218 radians is wrong is just an estimation and therefore is wrong so I'm justified in putting this on my paper instead right ( ln( (4i +3)/5)/i ) right? She couldn't mark...

**Trig**

Even if you have no idea what on earth any of this stuff is but have a vast knowledge in complex number system you might be able to help me as this is what I believe is preventing me from making sense of this stuff... Ok I'm trying to understand how you would know that sin...

**Algebra I**

Did I do these probelms correctly? Find the intercepts 1. y^2 = x^2 - 4x y^2 = x(x - 4) Y intercepts y^2 = 0(0 - 4) (0,0) x intercepts 0 = x(x - 4) 0 = x - 4 4 = x (4,0) 2. y = (x (x + 3))/(3x + 1)^2 y intercetps y = (0(0 + 3))/(3(0) +1)^2 y = 3/1 (0,3) x intercepts 0 = (x (x ...

**Algebra**

see like I'm kind of confused by this as well isn't this more simple x^-1 rather than 1/x ? can you please give like a deffinition of "simple" for equations what does it mean for an equation to be in it's most simplest forms? That I can apply to any mathe...

**Algebra**

Which one is more "simple"? (-7(2x + 3))/(x(x + 3)) or (-14 x + 21)/(x^2 + 3x) I would go with the factored form but i'm still kind of confused as to what exactly what it means for an equation to be "simple"

**Algebra**

I'm kind of confused as to what exactly simplified means by deffintion which one is more simple (2x)^6 or 64x^6 I thought simplified meant to do all the operation that can be done... but I've had some teachers who've makred that wrong because I didn't factor......

**Algebra**

What does it mean to be "simplified" which one is most "simple" 2(3+5) or 6 + 10 ??? I've been told both and wonder if someone can give me the correct answer some of my teachers told me simplified means all of the operations that can be done are done an...

**NEVERMIND**

figuered it out

**Algebra II**

ok now this is an algebra 2 problem... I have goten far down to hear e^(ix) = (4i +/- 3)/5 now how do I solve for x I feel really stupid now as this is algebra 2... can't use natural log right or the common log as ln( e^(ix) ) does not equal ix so what do I do?

**Calc**

ok this is now an algebra question...

**Calc**

how do I solve this arcsin(4/5) note that I am not looking for about 53 degrees I believe I'm suppose to solve euler's formula for x i.e. sin (x) = (e^(ix) - e^(-ix))/(2i) where x is in radians hence I would do something like this sin (x) = (e^(ix) - e^(-ix))/(2i) = 4/...

**Algebra 2**

how do I find the length and width of a rectangle when the width of the rectangle is 3 feet less tahn the length. The area is 18ft^2

**Jishka Staff**

Oh is there another one or are there no more on here who teach biology besides that teacher?

**Jishka Staff**

Is you teacher who teaches AP Biology still sick last time I heard I was told he was to sick to even come on here is he back yet... i also am unsure of his name... thanks

**college**

let i = the square root of -1 with i to the 1st power =i, i to the 2nd power= -1, i to the 3rd power =-i , i to the 4th power=1 find ito the power 215

**Biology/Math person please help**

Will thanks for the help and ya native language is actually English... I just have a hard time making sense of what the college board is trying to say sometimes that is all lol... but ya can somebody who knows biology well and a little bit of math check this out please thanks!...

**Sorry**

didn't know see your posts let me read them ignore these posts for the moment sorry :(

**Biology (To SraJMcGin or anyone who can help)**

Well I have found bits and pieces of that test online and found part of those questions on some power point that had 1986 next to it and the number of the question but no answers though...

**Biology (To SraJMcGin or anyone who can help)**

Ok can't right click copy paste scroll to the very top and you should be able to see the link and copy it into the adress bar with no spaces then press enter... The reason why I did that becasue the question was a couple of pages back and I cant post links If its easier fo...

**Biology (To SraJMcGin or anyone who can help)**

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 7 9 5 7 9 It's a webadress cant post links put it in your adress bar and delete the spaces then press enter. Thanks for the responses! By the way believe it or not those are actually from t...

**Biology (Please Dont Skip Over)**

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 7 9 5 7 9

**Biology**

I think my questions were skipped over ignore this post if this is not so... h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 7 0 5 2 8 h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 6 9 0 4 4 please post ...

**Biology**

Questions 109-111 refer to the map below of the distribution of several populations on the continents of Eurasia and North America. These populations were derived from a common ancestral species. The area enclosed by a given dotted line represents the distribution of the popul...

**Biology**

Iwas woudnering if you could help me with this problem. The answer key says that the answer is D and I have no idea why. The chart, included in the link, reads off a value of about .5 for the G locus for the year 1980 Finding the percent heterozygous should be as sipmle as 2(....

**Chemistry**

Ok apparently its just the mole ratio 2:1 from the coefficents so I just do 2(.507) to get my answer but how come I ignoered the coeficent of the Si in ther reaction?

**Chemistry**

Thanks for the help earlier My question Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas: Si + 2Cl2 yields SiCl4 In one reaction 0.507 mole of SiCl4 is produced. How many moles of molecular chlorine were used in the reaction? Ok is it makeing referen...

**Chemistry**

I know mathematically I can write chemical reactions this way but in chemistry can I if now why? 2K + 2(H20) yields 2KOH + H2 2(K + H20) yields 2KOH + H2 can I also do this if not why? 2(CO) + O2 yields 2(CO2) O(2C + O) Yields 2(CO2) I dont see why I cant do any of these thing...

**Chemistry**

I have realized I don't understand Avagado's number at all My book shows me this diagram instead of just providing a simple formulas that makes no sense at all here is what I have made sense of so far (6.022 x 10^23 atoms/mol)(mass of element) = molecular mass were mol...

**Chemistry**

What is wrong with or ambiguous about hte phrase "four molecules of NaCl" I really dont understand my textbook says in the back that it is an ionic compound so I guess that its not really a molecule then I don't understand...

**AP Biology**

I got a question that comes from the 1990 released test #61 that I'm completley lost on 61. In a population that is in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain hereditary trait is 0.20. What percentage of the individuals in the next gen...

**Public High School AP Biology**

I got a question that comes from the 1990 released test #61 that I'm completley lost on 61. In a population that is in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain hereditary trait is 0.20. What percentage of the individuals in the next ge...

**physics**

danks 4 includN units kid refuse to solve w/o dem sorry

**Chemistry (algebra I problem)**

I feel really dumb because I cant figuer out this simple algebra I problem... 84. The diameter of a copper (Cu) atom is roughly 1.3 x 10^-12 m. How mnay times can you divide devenly a piece of 10-cm copper wire until it is reduced to two seperate copper atoms? (Assume there ar...

**Public High School AP Biology**

I got a question that comes from the 1990 released test #61 that I'm completley lost on 61. In a population that is in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain hereditary trait is 0.20. What percentage of the individuals in the next gen...

**Chemistry**

What is the pH of a 0.42 M NH4NO3 aqueous solution? What is the percent ionization?

**Chemestry**

What is the pH? 1.6 x 10^(-5)?

**Algebra**

Thanks!

**Algebra**

Is this correct? If not can you please tell me what steps I did wrong? Thanks! The hydrogen ion concentration of milk is about 1.6 x 10^-7 moles per liter. Find the pH. pH = -log [H+] pH = -log[1.6 x 10^-7] pH = -(-7.204119983) pH = 7.2 The pH balance of the milk is 7.2

**Calc**

I'm kind of rusty on my calc here... ok ther's a graph of velocity vs time w/ velocity in m/s and time in seconds were time is of course the x-axis k I'm asked to describe how the velocity changes over the timer interval in this interval the graph consists of three...

**Algebra**

It is actually for an Intermediate Algebra class. Logitharims.

**Algebra**

The hydrogen ion concentration of milk is about 1.6*10^-7 moles per liter. Find the pH.

**Calculus**

How to prove this (e^(2^-1 i3pi) - e^-(2^-1 i3pi))/(2i) = -1 if you could show me this that would be really great btw e is eulers number i = imaginary number sqrt -1 and pi = 3.14... THANKS!!!

**Algebra 2**

a rectangle table is five times as long as it is wide if the area is 245 feet ^2 find the length and width of the table

**chemistry**

How much Fe++ could be present in water containing 0.8 x 1e-02 M HCO3- (bicarbonate) without causing the precipitation of FeCO3 (Ksp=10**(-10.7))

**Chemistry**

nevermind..i got it

**Chemistry**

Magnesium fluoride dissolves in water to the extent of 8.0 10-2 g/L at 25°C. Calculate the solubility of MgF2(s) in moles per liter, and calculate Ksp for MgF2 at 25°C. I've been doing this and getting .086. Please help!

**Algebra**

Write an equation of the line satisfyingg the given conditions. Slope = -2/3; y-intercept of 2

**Math (trig)**

4cos(x)+5=6sec(x)

**Algebra**

Determine whether the lines are parallel, perpendicular, or neither. y = 9x + 9 and y = -9x + 9

**Algebra**

Write an equation of the line satisfying the given conditions. Horizontal line through (-2, -5)

**Math**

Thanks, I am so lost.

**biology**

Pick one of the multiple choice that best matches the answer. For grasshoppers and locusts to be in the same family they must also be in the same a. order b. group c. genus d. species two members of the same ___ would be most clostly related. a. order b. group c. genus d. species

**spanish**

what is the conjugation for I listened He use to take I slept

**Economics **

Programs aimed only at people who are poor or disabled are known as? a. social insurance programs b. governmental programs c. federally funded programs d. public assistance programs

**PreCalculus REINY HELP PLEASE**

well yay thanks for the answer but i really need the formula lol I tried to derive it on my own but it was a little bit rough lol i need the formula it wasn't in my book and I don't know what the name of the formula would be so i can't really google it...

**PreCalculus**

Hi im unsure how do this problem becasue I do not how to go about these types of problems were you make monthely payments each month of the same amount... Janene contributes $50 per month inot the Chaing China Bond Fund htat earns 7.26% annual intrerest. What is the value of H...

**Precalculus**

Hi im unsure how do this problem becasue I do not how to go about these types of problems were you make monthely payments each month of the same amount... Janene contributes $50 per month inot the Chaing China Bond Fund htat earns 7.26% annual intrerest. What is the value of ...

**PreCalculus**

Still need help please post in this one that way i don't have to search through the old stuff h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 2 3 2 6 8 8 0

**Precalculus**

please still stuck h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 2 3 2 6 8 8 0

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