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September 17, 2014

Posts by kate


Total # Posts: 1,686

Math/Vectors
Thanks!
October 17, 2010

Math/Vectors
If a point on the surface of a sphere with its center at the origin has coordinates (9,4,6) how do you show the radius connecting the origin to this point as a position vector. Is it simply [9,4,6] or is it more complicated than that. Thanks.
October 17, 2010

Math
I think it's correct. The negative sign in front of the parenthesis was throwing me off. Just need to make sure I'm understanding it correctly.
October 17, 2010

Math
How about this one? Simplify: -(21k - 3 + 4) - 17k -21 + 3 + -4 - 17k -38k + -1
October 17, 2010

Math
Just so I know I am understanding this, can you please let me know if I am doing this right? Simplify: 24u - 6(8 - 4u) + 52 24u -48 + 24u + 52 48u + 4 Thanks!!!!
October 17, 2010

algebra
If f(x)=x^2-x, find the value if x=(2)-2. TIP: x^2 means x squared
October 17, 2010

Math/Vectors
I need help on a homework problem. "Determine a vector equation for the line perpendicular to 4x-3y=17 and through point (-2,4). The answer in the book is given as [x,y]=[-2,4]+t[-4,3].Isn't the normal to the scalar equation [4,-3] and wouldn't this be the ...
October 16, 2010

Chemistry
Can someone explain to me what the calorimetry equation - q=(m)(ΔT)(Cp) means exactly, in your own words, and how identifying an unknown metal relates to every day life? thanks
October 13, 2010

math
y = 2.5 ·4^x as the equation for the blue line shown in the graph, rather than the equation given in your text. Note that your line will now be tangent to the graph at the point ( 0, 2.5 ). Enter the value of c here
October 13, 2010

math
The population of the town of Missed Chances has, since January 1, 1972, been described by the function P = 30000 ( 1.01 )^t where P is the population t years after the start of 1972. At what rate was the population changing on January 1, 1995? people per year
October 13, 2010

science
Calculate the molarity of 500. mL of solution containing 21.1 g of potassium iodide
October 12, 2010

Chemistry
A gas sample is connected to a closed-end manometer. The difference in mercury levels in the 2 arms is 115 mm. What is the gas pressure in torr if the atmospheric pressure is 750. torr?
October 12, 2010

Math
A lunch box is 30cm long, 14cm wide and 12cm high. The formula for the volume of a box is v=lwh. Find the volume of the lunch box in cubic centimeters. Can you help me to set this up? Thanks!!!
October 10, 2010

math
find an equation of the line containing the given pair of points. Use function notation to write the equation. (5/7,10/14) and (-1/7,13/14) f(x)
October 8, 2010

math
how do I solve the equation (y+6) divided by 3- (y-3) divided by2=2
October 7, 2010

Physics
29
October 7, 2010

chemistry
At 25 degrees celsius, the dimensions of a rectangular block of gold are 4.42 cm by 3.07 cm by 2.63 cm. The mass of the gold is 689g. I found that the density is 19.3g/cm^3 at 25 degrees but how will the density change if the temperature is increased to 125 degrees?
September 30, 2010

math
How can you make 7 by only using the digits 1, 2, 3, and 4? You can put two numbers together (ie 12 or 34). You can use the operations: addition, subtraction, multiplication, (NO DIVISION!!), exponents, and parentheses any way you want!! Please help!!!! I also need 13, 17, and...
September 29, 2010

english
yes and yes
September 29, 2010

english
yes
September 29, 2010

math
x=6 so i believe the answer would be 18+12+12 which equals 42 im not for sure though but thats how i think you would do it
September 29, 2010

math
Thanks!!!!!!!!!!!
September 29, 2010

math
How can you make 34 by only using the digits 1, 2, 3, and 4? You can put two numbers together (ie 12 or 34). You can use the operations: addition, subtraction, multiplication, (NO DIVISION!!), exponents, and parentheses any way you want!! Please help!!!!
September 29, 2010

math
I think the formula would be 30=2.25x
September 29, 2010

math
6r-3=15 -3 -3 __________ 6r=12 then do 12 divided by 6 and the answer is simple!!!!!
September 28, 2010

Teachers Aide/Early Childhood Education and After-
never mind! omg! i made a huge mistake! don't follow my answers! these are the answers to test #02604200
September 28, 2010

Teachers Aide/Early Childhood Education and After-
okay, you've got a lot wrong. 1) pg. 59 2) pg. 28,33 3)A 4) pg. 57 5) pg. 16 6) pg. 4-5 7) pg. 26 8) pg. 30-31 9) A 10) pg. 60 11) pg. 2 12) B 13) pg. 8 14) pg. 13 15) D 16) C 17) B 18) pg. 58 19) pg. 36-37 20) pg. 64
September 28, 2010

Math
Just checking to make sure I understand this. Absolute value bars are grouping symbols. Use the order of operations to evaluate the expression -3 + /-x + 2/ when x=12 -3 + /-12 + 2/ = 11 Thanks!
September 27, 2010

Chemistry
A water solution containing 25.0% sucrose by mass, has a density of 1.25g/mL. What volume of this solution in liters, must be in an application requiring 2.50 KG of sucrose?
September 27, 2010

Biology Chemistry Part
I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece of paper and ...
September 26, 2010

Biology Chemistry Part
I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece of paper and ...
September 26, 2010

algebra
thank you
September 25, 2010

algebra
3x+y=7 for y -x+y=13 for y f=5gh for h
September 25, 2010

science
choose a metal you know and list three uses that illustrate three properties of metals
September 23, 2010

algebra
solve the equation and check -(9x-4)-(2x-6)+7=-8(x-9)-(6x+2)+4
September 18, 2010

calculus
Use the following function values to calculate H '(1). f (1) f '(1) g(1) g'(1) 3 -4 8 -1 H(x) = x/(g(x) f(x)) How would this problem be done... i found H(x) to be 1/24 but don't know how to find the derivative of h'(1)
September 18, 2010

algebra
solve each equation 4(n+3)=2(6+2n)
September 18, 2010

math
Simplify the expression 4(3z^3-6)+12(2-z^3)=
September 15, 2010

algebra II
sorry for calling it an equation i mean i have to simplify the expression
September 9, 2010

algebra II
need help solving the equation 5y-14+7y-20y
September 9, 2010

Math
Kim is twice the age of Ryan. In 4 years Kim will be 7 years older than Ryan. How old is Kim now?
September 9, 2010

chemistry
793.4 g
September 8, 2010

chemistry
a brain weighing 1.0 Ib occupies a volume of 620 ml. What is the specific gravity of the brain?
September 7, 2010

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 ...
September 7, 2010

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?
September 5, 2010

algebra 1
how to simplify and solve 2/5(20x+5)-1/2(8-4x)=38
September 5, 2010

math
Sam ran between 8 and 15 miles a week for 5 weeks.About how many miles could he have run?
September 1, 2010

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 ...
August 19, 2010

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 ...
August 16, 2010

Physics
Convert 5:25:25 to seconds.
August 16, 2010

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 ...
August 16, 2010

Calculus
dont worry about it i think i'm gettin g some where
August 12, 2010

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 ...
August 12, 2010

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
August 12, 2010

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
August 12, 2010

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 ...
August 2, 2010

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!
July 28, 2010

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.
July 28, 2010

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 ...
July 28, 2010

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...
July 28, 2010

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 ...
July 28, 2010

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 ...
July 27, 2010

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 ...
July 27, 2010

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 ...
July 27, 2010

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 ...
July 27, 2010

Algebra
(60 + 16sqrt(15))/(60 + 17sqrt(15)) i tried dividing but got stuck thanks
July 26, 2010

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 ...
July 25, 2010

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 ...
July 25, 2010

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"
July 24, 2010

Calc I
Solved
July 24, 2010

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 ...
July 24, 2010

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 ...
July 24, 2010

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 ...
July 23, 2010

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 -...
July 23, 2010

Algebra I
nevermind
July 23, 2010

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!
July 23, 2010

algebra
Use the quadratic formula (40 +/- sqrt((-40)^2 - 4(-6)(-50) ))/(2(-6)) what ever that comes out to be
July 23, 2010

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?
July 23, 2010

RESPONSE
My instructions were just to "Evaluate" why is that not considered an angle?
July 23, 2010

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...
July 23, 2010

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...
July 22, 2010

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...
July 21, 2010

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 ...
July 21, 2010

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"
July 21, 2010

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...
July 21, 2010

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 ...
July 21, 2010

NEVERMIND
figuered it out
July 20, 2010

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?
July 20, 2010

Calc
ok this is now an algebra question...
July 20, 2010

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/...
July 20, 2010

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
July 17, 2010

Jishka Staff
Oh is there another one or are there no more on here who teach biology besides that teacher?
July 13, 2010

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
July 13, 2010

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
July 5, 2010

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...
July 4, 2010

Sorry
didn't know see your posts let me read them ignore these posts for the moment sorry :(
July 4, 2010

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...
July 4, 2010

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 ...
July 4, 2010

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 ...
July 4, 2010

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
July 4, 2010

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