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March 29, 2015

Posts by kate


Total # Posts: 1,734

math
solve for x x^2-x+8=0
October 30, 2008

Math
so what would the x-intercepts be? (SQRT3, SQRT-3) ?
October 30, 2008

Precalc
how do u find the zeros of x^3+13x^2-16x+8? w/o a calc?
October 29, 2008

Math age problem
A mother is thrice as old as her son.Six years from now,she will be forty-four yeras more than one-third her son will then be.How old is the mother now?
October 29, 2008

Chemistry
Yes, the 2nd reaction is the 1st reaction reversed. The book says when you have a reaction that is reversed, take the opposite sign of the ÄH... which should be -154 by that definition. I'm not sure if I am suppose to divide 154 by 2??
October 28, 2008

Chemistry
HELP!! I cannot find the value of ÄH, for the following reactions. A + 2B --> C + 3D , ÄH = 154 kJ 1/2C + 3/2D --> 1/2A + B, ÄH= ? I have tried the answers -302 and 154 and neither were correct. Have any suggestions?? Thank You!
October 28, 2008

Chemistry
It worked!! Thanks so much for your help!
October 28, 2008

Chemistry
I did not get the correct answer... Solve for MassSteel. Here is my work- masssteelx specific heat rod x (Tfinal-Tinitial) + massH2O x specific heat water x (Tfinal-Tinitial) = 0 MassSteel = -massH2O x specific heat water x (Tfinal-Tinitial)/ specific heat rod x (Tfinal-...
October 28, 2008

Chemistry
I need help! I found the change in Temp= -.9 degree C. I don't know what to do next...? What value from this problem do I use as my q(heat capacity) to plug into the equation q= m X Cs X change T? The question states: 120mL of H2O is intially @ room temp (22 degree C). A ...
October 28, 2008

Pre-Calculus
SMALL-SAMPLE CONFIDENCE INTERVAL FOR A POPLATION MEAN 90% Confidence Interval = x-bar +/- 1.65 * s/SQRT(n) n = NUMBER OF SAMPLES [3] Cumulative Distribution Function Student's t distribution with 3 DF x P( X <= x ) 1.65 0.901247
October 26, 2008

algebra - Help!
The local fish market is having a sale on whole fish. the prices are as follows: You can buy an albacore and a barracuda for$21 You can buy a barracuda and a carp for $32 You can buy a carp and a dogfish for $32 You can buy a dogfish and an eel for $37 You can buy an eel and ...
October 25, 2008

rudcing fractions
how would i reduce 45/108 or make it a mix numberb
October 25, 2008

Dividing fractions
and how do you reduce fractions isnt it dive the bottom number by the top
October 25, 2008

Dividing fractions
thank you very very much
October 25, 2008

Dividing fractions
how do i do 3 and 3/4 divided by 12 and 1/2 plz help
October 25, 2008

Math pizzaz pre algraba
What magic tricj dies Mr.Utterbunk perform ever evening
October 25, 2008

calc
calculate the critical points of f(x)=xe^-x i plugged in zero in the derivative, and i got: e^-0*0e^-0 = 0 1*0= 0 so is the critical point zero then???
October 23, 2008

math!
f(x)=x^3-6x+1 find the critical points, where the function is increasing or decreasing and explain the shape of the graph using the derivative and algebra. i found the derivative to be 3x^2-6. So the critical points are -1.4 and 1.4. The derivative is decreasing until (0,6) ...
October 23, 2008

college calculus
yes, i feel like such an idiot, but it makes sense now. thank you!!!
October 23, 2008

college calculus
find a and b so that f(x)=x^2+ax+b has a local min at (6,-5) i found the derivative: f'=2x+a then i found a 0=2x+a 0=2(6)+a 0=12+a a=-12 but i can't seem to get the correct value for b. i plugged -5 into the original function, but my book says the answer is b=31. how ...
October 23, 2008

french
oops sorry, chemise is shirt, not blouse
October 23, 2008

french
Au bazar de la ville,- at the village market/bazar il choisit un pantalon rose - he chose pink pants une chemise a pois-a polka dot blouse et des bottes-and some boots en lezard! - not sure what lezard means, je suis desolee.
October 23, 2008

9th grade english
you are as unique as an m and m You as sweet as an m an m
October 23, 2008

9th grade english
isnt a metaphoring comparing to things using like or as
October 23, 2008

social studies
like how he says he wants to give the taxes or somthing like that to other people
October 23, 2008

social studies
his fault like as in raising the taxes or distrapution
October 23, 2008

social studies
I need help making a political cartoon. It needs to be about obama any help is greatly apreciated
October 23, 2008

english
Well M and m are all diffrent colors and since all the m and m arent the same color it means there uniquine and people arnt all the same we are all unique do you get what i am saying
October 23, 2008

english
what do you mean like an M and m candy
October 23, 2008

calc I
how do i find the critical points of the function g(x)=xe^-x i think the derivative is xe^-x*-x^2e???
October 23, 2008

calc I
f(x)=x^3-6x+1 find the critical points, where the function is increasing or decreasing and explain the shape of the graph using the derivative and algebra. i found the derivative to be 3x^2-6. So the critical points are -1.4 and 1.4. The derivative is decreasing until (0,6) ...
October 23, 2008

calculus I
find a and b so that f(x)=x^2+ax+b has a local min at (6,-5) i found the derivative: f'=2x+a then i found a 0=2x+a 0=2(6)+a 0=12+a a=-12 but i can't seem to get the correct value for b. i plugged -5 into the original function, but my book says the answer is b=31.
October 23, 2008

english
thank you!
October 22, 2008

english
what exactly does this phrase mean.... such discourse facilitates the praxis of hope??? i think it means that discussion facilitates the practice of hope...but i looked up the definition of praxis and i'm not sure which one fits the context of this sentence.
October 22, 2008

Chemistry
How do I convert the atmospheric pressure = 30.17in to mmHg? also how do I convert to mm H2O?
October 21, 2008

ap biology
what are two examples of roles of predation in population control (tundra biome)
October 21, 2008

college biology
why is autophagy not considered endocyctosis?
October 19, 2008

Pre-calculus
This is a right triangle. Therefore the Pythagorean Law applies. 150^2+300^2= Distance^2 22500+90000=D^2 112500=D^2 335.41=D Rounded to the nearest tenth, D=335.4 feet
October 19, 2008

Biology
What is an adenosine triphosphate? I don't understand the fancy definitions. Can some one please simplify it for me? Thanks!
October 8, 2008

6th grade
They are lines that run next to each other, but can go on forever and never meet or intersect.
October 8, 2008

Current events
Does anyone know pakistan's current position on russia/georgia, the environment,and the status of permanent refugees?
October 5, 2008

Math
Can you explain that?
October 2, 2008

Math
what is the answer if, for example, the base number is 8 and the exponent is 0?
October 2, 2008

Math
S = 11 + 18 + 27 + 38 + 51 + 65 + 82 + .........+Tn S = 11 + 18 + 27 + 38 + 51 + 65 + ................ + Tn --------------------------------------... 0 = 11 + (7 + 9 + 11 + 13 + ....(n-1).terms.................) - Tn 0 = 11 + (n - 1)/2 [14 + 2(n - 2)] = 11 + (n - 1)(n + 5) - ...
October 1, 2008

math
Determine if there exists a real number that is exactly one less than its cube. If so, find the value of the number. (Hint: IVT)
September 30, 2008

Science
A girl is pulling a sled up a hill with a force of 5N. The wind is blowing at her back (uphill) with a force of 15N. The force of gravitity is 20N and friction between her boots and the snow is 5N. What is the net force, including direction, of this situation?
September 30, 2008

Math
You have 84 coins, in dimes or nickles that equal $7.15, how many dimes and nickles
September 30, 2008

Science
A car is driving up a hill with a force of 40N. The wind is blowing downhill with a force of 10N. Gravity is affecting th car with a force of 20N. The force of friction is 9N. What is the net force, including direction, of this situation?
September 30, 2008

Pre-calculus
x = r cos(45) ...(1) y = r sin(45) ...(2) Dividing (2) by (1): y / x = tan(45) = 1 y = x.
September 30, 2008

math
WHAT EVER YOU DO TO ONE SIDE YOU DO TO THE OTHER SIDE
September 29, 2008

math
-10h-6=24 +6 +6 10h 30 _--- _----- 10 10 h=3 SADS =same sings add different subtract
September 29, 2008

math
can you put patterning questions up on your website like youdidfor algebra an arthemitics?
September 28, 2008

Philosophy - Logic
I keep getting different answers from different sources on these questions... I'm still not sure. Anyone else who can lend their opinion? #1 I need to know if this is a real or apparent argument. A: I saw Bob with Mary last night. B: You saw Frank, Bob's identical twin...
September 14, 2008

LOGIC
Oops. In the first set of statements, both statements should read "Mary."
September 10, 2008

LOGIC
I keep getting different answers from different sources on these questions... I'm still not sure. Anyone else who can lend their opinion? #1 I need to know if this is a real or apparent argument. A: I saw Bob with Mary last night. B: You saw Frank, Bob's identical twin...
September 10, 2008

Philosophy - Logic
#1 I'm having trouble understanding why you say it is not a real arguement. Person A is stating that he saw Bob and person B is saying that person A really saw Frank. How is it possible for the two statements to both be true and thus inconsistent? #2. Can't person A ...
September 10, 2008

Philosophy - Logic
I have a few logic questions that I am having difficult with and would be greatful for any insight... #1 I need to know if this is a real or apparent argument. A: I saw Bob with Mary last night. B: You saw Frank, Bob's identical twin, with Marsha last night. I'm ...
September 10, 2008

Math/Calculus
Find k so that the following function is continuous on any interval: f(x)= kx 0 (less than or equal to) x (less than) 2 3x^2 2 (less than or equal to x) i know the answer is 12 but i don't know how to arrive at that. could you please walk me through the steps? thanks.
September 9, 2008

HELP! MATH
cold yam is put into a hot oven, the temperature of the yam begins to rise. The rate R in degrees per minute at which the temperature rises is governed by Newton's Law of Heating, which says that the rate is proportional to the temperature different between the yam and the...
September 7, 2008

Math
A cold yam is put into a hot oven, the temperature of the yam begins to rise. The rate R in degrees per minute at which the temperature rises is governed by Newton's Law of Heating, which says that the rate is proportional to the temperature different between the yam and ...
September 7, 2008

Calculus
A cold yam is put into a hot oven, the temperature of the yam begins to rise. The rate R in degrees per minute at which the temperature rises is governed by Newton's Law of Heating, which says that the rate is proportional to the temperature different between the yam and ...
September 7, 2008

French
1. j'ai un ordinateur. 2. vous n'avez pas de chaise. forms of avoir j'ai tu as il/elle a nous avons vous avez elles/ils ont
September 7, 2008

earth science
how does radioactive decay provide heat energy within the earth
July 19, 2008

Algebra
A guy wire reaches from the top of a 24 ft. pole to a point on the ground 8 ft. from the pole. Find the length of the wire.
June 18, 2008

geometry
i didn't understand the concept of symmetry in maths ? what is its use in the field of mathematics? what is tha aplication of symmetry of symmetry in various fields. somevdy please answer
June 14, 2008

Spanish 2
Write correct preterite forms of the verbs ir and estar to complete conversatin. Claudia y yo ______a comprar sellos; _______ en el correo por quince minutos. Elías _________ a cobrar un cheque; ______ en el banco por veinte minutos. Irene y Marcos ______ a comprar unos...
June 13, 2008

civics
what amendment number restricts the president in regards to treason, bribes, and being impeached?
May 27, 2008

Italian
How do you say "twin town" in Italain. I know its "Une ville jumelle" in french. A.s.a.p X
May 26, 2008

science
How is sickle cell anemia maintained in our world (why doesn't it eradicate itself)?
May 25, 2008

science
can someone help me answer this question? How is the sickle anemia gene maintained (why doesn't it destroy itself)?
May 25, 2008

science
I dont understand what this question is asking (what does it mean by physiology) Explain the physiology of sickle cell anemia.
May 24, 2008

french
Ok thank-you! I also have a question: I said the address was 34, rue.... and that still is the address. Should I use the imparfait for that or is it o.k.? Nous sommes allées au Musée des Tissus et des Arts Décoratifs à onze heures. L’adresse a...
May 23, 2008

french
CAn someone proof read this? Nous sommes allées au Musée des Tissus et des Arts Décoratifs à onze heures. L’adresse a été 34, rue de la Charité, Lyon, France 69002. Nous avons vu des textiles du dix-huitième si&...
May 23, 2008

english
nevermind
May 22, 2008

english
how can i use the word caustic in a sentence that relates to the book "A Separate Peace"
May 22, 2008

science
I do not understand this question. I tried to answer it but I am completely at a loss. Can someone help? Describe how the number of antibodies produced and time it takes to produce such antibodies differs between first time exposures and all subsequent exposures.
May 20, 2008

Pre-Algebra
I am having problems with graphing inequalities how do you do them for example x + y < 3 or x> -2
May 18, 2008

Organic Chemistry
I just wanted to get these checked. I think 1 is b, 2 is a, 3 is d, 4 is c, 5 is e and 6 is a
May 13, 2008

Organic Chemistry
I got some multiple choice questions to practice and I'm not sure of how to get the answers... 1). Which of the following corresponds to the COC bond angle in dimethyl ether?-94 degrees, 110degrees, 180 degrees, 122 degrees, or 60 (i think it's 110 2). classify the ...
May 13, 2008

chemistry
Yup! Thank you!
May 12, 2008

chemistry
I'm reviewing for a test tomorrow, and I was wondering about this question. Convert 55 mi/gal to meters/liter. I'm not sure how to go about it, though when I tried it I got 89000.0m/4L. But, I'm not sure if that is right.
May 12, 2008

chemistry
Okay, good. I think I'm all set then. Thank you!
May 7, 2008

chemistry
I was thinking that if, for example, two different pressures were given, two different volumes were given, two different temperatures were given and only one mole, then you use P1V1/n1T1...etc to find the missing mole. But, if only one pressure, one volume, and one temperature...
May 7, 2008

chemistry
I know how to use the equations pv=nrt and P1xV1/n1xT1 = P2xV2/n2xT2, but I don't understand when to use them. I have a test tomorrow and I'm going over some word problems, but I can't figure out how decide which formula you need to use. Is there a specific way to ...
May 7, 2008

Chemistry -- to Dr.Bob I need your help!!!
how do you do this
May 6, 2008

history, and your opinion
The songs Lift Every Voice and Sing and America the Beautiful both have religious refernces in the first stanza. Our current national anthem, The Star Spangled Banner does not. Traditonally only the first stanza is sung at baseball games and events. I need to come up with ...
May 5, 2008

Chemistry
So, for KCl, using the graph... T.....mass KCl/100 mL 10....30 20....32 or 33 30....35 40....38 50....41 60....44 70....46 80....49 90....52 or 53 100...56
May 5, 2008

Chemistry
In the question above this one it says refer to a solubility chart, but my professor never taught us how to answer these questions while using a solubility chart so I have no idea what to do. I've tried going to his office hours for help, but he's only there when I ...
May 5, 2008

Chemistry
How many grams of KCl can you dissolve in 50. g of water at 70 degrees C?
May 5, 2008

Chemistry
Thank you, I made the change. My professor is very precise, so I'm glad you noticed that!
May 2, 2008

Chemistry
mols HCl = 0.750 M x 0.025 L = 0.0186 mol M = 0.0186 mol/0.500 L = 0.0372 the answer is 0.0372 mol/l
May 2, 2008

Chemistry
What is the concentration of a solution prepared by diluting 25.0 mL of HCl 0.750 mol/L to a final volume of 500. mL?
May 2, 2008

Advanced Math
Find the values of x for which the equation sin x = -1 is true 2 pi n pi/2 + 2 pi n pi + 2 pi n 3 pi/2 +2 pi n Can someone please help. I dont understand how to do this.
May 1, 2008

chemistry
If A is a non-polar chemical and B is a non-polar solvent, what type of solubility (high or low) would you expect between A and B? --Is it high solubility?
April 29, 2008

Chemistry
So, if I convert mmHg to atm I get .904 atm. When I plug that into the equation, the final answer is 67.1 L?
April 22, 2008

Chemistry
Okay... 1) 275 g NaCl ----> 4.71 mol NaCl 2) Next, 4.71 mol NaCl * 1Cl2/2 NaCl = 2.36 mol Cl 3) V= nRT/P v= (2.36 mol)(0.0821 L atm/K Mol)(313K)/687mmHg = 0.0883 L Final answer: v = 0.0883 L
April 22, 2008

Chemistry
Sodium reacts with chlorine gas according to the reaction:\ 2 Na (s) + Cl2 (g) ---> 2 NaCl (s) What volume of chlorine gas, measured at 687 mmHg and 313 K, is required to form 275 g of NaCl?
April 22, 2008

Chemistry
Is this correct? (755 mmHg)(400.0cm^3)/298 K = (P2)(50.0cm^3)/(358 k)
April 21, 2008

Chemistry
If a gas has a volume of 400.0 cm cubed at a pressure of 755 mmHg and a temperature of 25 degrees celsius, what would be its pressure (in atm) at 85 degrees celsius if the volume is reduced to 50.0 cm cubed?
April 21, 2008

Chemistry
A tank contains 0.450 kg of oxygen(O2) compressed into a volume of 2.32 L. Estimate the gas pressure (in atm) inside the tank at 5 degrees celsius. Do I convert 0.450 kg from grams to moles, and if I do, do I use the molar mass of oxygen?
April 19, 2008

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