Tuesday
September 23, 2014

Posts by katie


Total # Posts: 1,669

college math
The range can be found by plugging the values of the domain in the equation. For example, 3/(-3-6)=-1/3 -1/3 is part of the range because the range represents the outputs or y values that correspond to the inputs (the domain), or x values
March 15, 2010

Trig
How do I solve the following? sec 3 theta/2 = 2 on the interval 0<theta<2 pi? I tried to look in my textbook but it doesn't have an example. I also tried google and I was unsuccessful> How do I do this question? I know that the period for sec is 2 pi but I don'...
March 14, 2010

Chemistry
For a reversible reaction where A + B (both arrows) C + D, the equilibrium constant is represented by kc = 5.3 = (c)(d)/(A)[B]. Initially A and B are present at 2.00 M each. What is the final concentration of A once equilibrium is reached. I made an ICE table and came up with ...
March 11, 2010

Chemistry
thanks, i double checked and everything looks right. i'm going with answer d. thank you again!
March 11, 2010

Chemistry
2H2 (g) + O2 (g) <---> 2H2O (g) what is the likely magnitude of the equilibrium constant? a) k < 10 ^-3 b) 10^-3<K<10^3 c)k=0 d)k>10^3 i know that choice c is incorrect because if k=o there would be no need to calculate equilibrium, but how would i go about ...
March 11, 2010

College Chem II
Determine the [H3O+] of a 0.160M solution of benzoic acid.
March 7, 2010

College Chemistry
THANK YOU!
March 7, 2010

College Chemistry
Thanks for your help! I understand number 2, but I still don't get number 1. Is there any other way to explain it?
March 7, 2010

College Chemistry
What is the pH of the following solutions? 1)a solution that is 5.4×10−2 M in HClO4 and 3.0×10−2 M in HCl 2)a solution that is 1.80% HCl by mass (Assume a density of 1.01g/mL for the solution.) Please help! I am so confused!
March 7, 2010

CHEMISTRY
Is non-dairy creamer a colloidal dispersion
March 7, 2010

CHEMISTRY
Would non-dairy creamer also be a colloidal dispersion when placed in water?
March 7, 2010

CHEMISTRY
If a pinch of flour is placed in water, does it form a coarse suspension, colloidal dispersion, or true solution? What about pepper? I thought both would be a coarse suspension
March 7, 2010

CHEMISTRY
Would non-dairy creamer also be a colloidal dispersion if it is put in water?
March 6, 2010

CHEMISTRY
When powdered milk is added to water, is it a coarse suspension, true solution, or colliodal dispersion? What about baking soda in water?
March 6, 2010

physics
Water flows over Victoria Falls, which is 128 m high, at a rate of 1.4 x 106 kg/s. If half the potential energy of this water were converted into electric energy, how much electric power would be produced by these falls?
March 4, 2010

Math
Ok i got that too... it comes to a fraction but then when you check it in the equations you don't get the same answer.
February 28, 2010

Math
Solve the system of linear equations by elimination. Thank You for your help. 8x+10y=3 3x-5y=2
February 28, 2010

math
6 6 6 6 = 5 fill in the expressions to make this equation true
February 28, 2010

Calc
how do i begin to solve this? integral of (1/x^2)sec(1/x)tan91/x)dx I tried substituting tan(1/x) for u but i couldn't get it to work...
February 27, 2010

Calc
that is actually the answer (that my book gives) how did you get that??
February 27, 2010

Calc
How do i begin to solve this? integralof dx/(cube root of 3x+4)
February 27, 2010

Geometry
B (i think)
February 24, 2010

Physics
Two blocks are connected by a light string passing over a pulley. The inclined surfaces are frictionless, and the effects of the pulley can be ignored. The value of m1 = m2 = 1.0 kg and θ2 = 43.4 degrees. If the blocks accelerate to the right with acceleration a = 0.280 m...
February 23, 2010

math
1+1
February 23, 2010

physics
Small, slowly moving spherical particles experience a drag force given by Stokes’ law: where r is the radius of the particle, is its speed, and η is the coefficient of viscosity of the fluid medium. (a) Estimate the terminal speed of a spherical pollution particle of...
February 19, 2010

math
MIX W 5 CUPS CONCENTRATE AND 8 CUPS COLD WATER. SUPPOSE YOU MAKE ONLY 1 CUP OF MIX W. hOW MUCH WATER AND HOW MUCH CONCENTRATE DO YOU NEED?
February 16, 2010

english composition
i have a hard time understanding to write essay and start paragraph
February 13, 2010

college
how do you start with an essay with contrast and compare about your life now and five years ago ?
February 13, 2010

statistics
If ten households in this area are selected at random, what is the probability that exactly two of them will be in violation of this law?
February 11, 2010

Physics
If you can throw a ball vertically upward to a height h = 30.5 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed?
February 8, 2010

Physics
A rock thrown horizontally from the top of a radio tower lands 20.0 m from the base of the tower. If the speed at which the object was projected was 11.50 m/s, how high is the tower?
February 8, 2010

physics
A ball is thrown upward from a platform 4.6 m high with a speed of 23 m/s at an angle of 40 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
February 8, 2010

AP world history
Okay thanks, I'm writing a document based question and my teacher isn't very good at helping me with anything. I found the religions they gave me to work with so not helpful or relative to each other in anyway.
February 7, 2010

AP world history
Religions of common geographic origins tend to differ from others that originate in other areas of the world. How do religions having common geographic origins tend to share somewhat common codes of behavior and views or the nature and reason for existence?
February 7, 2010

chemistry
I put down that there are 98 protons, 3 neutrons
February 4, 2010

chemistry
State everything you know about the following atoms. Do NOT assume that they are balanced or neutral. Atomic number = 98 Mass number = 101
February 4, 2010

Physics-College
You have a 50V battery in a circuit with a single resistor R. If the resistor dissipates 200 J of energy in 5 seconds, what is its resistance?
February 4, 2010

College Physics
For the speed at which the ball was launched I got 18.12m/s. That part was right according to the computer. I didn't understand parts b or c of the question. For part a you multiplied vt by .608 instead of .6018 and that is why I got a different answer. Could you explain ...
February 1, 2010

College Physics
A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
February 1, 2010

college Physics
The coordinates of an object moving in the xy plane vary with time according to the following equations x = −7.16 sin ùt and y = 4.00 − 7.16 cos ùt, where ù is a constant, x and y are in meters, and t is in seconds. Write expressions for the ...
January 31, 2010

college Physics I
I have tried to put the numbers in the equation, but I am not getting the correct answer. Is there an easier way to explain it?
January 29, 2010

college Physics I
A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
January 29, 2010

college Physics
A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
January 29, 2010

math/probability
Assume that the weight loss for the first two months of a diet program has a uniform distribution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses more than 11 pounds in the first two months.
January 24, 2010

Chem Apps
The solubility of sugar (surcose) in water is 4.0 g/mL at room temperature, what is the maximum amount of sugar that will dissolve in 850 mL of water?
January 21, 2010

Chemistry
The mass percent of a three component gas sample is 95.2% PF5, 1.40% C2H2 and 3.40% C3H6. Calculate the partial pressure (atm) of PF5 if the total pressure of the sample is 570.0 torr.
January 20, 2010

4th grade
I need to know I good way to do long division. The problem is: It takes 14 oranges to make a small pitcher of juice. Annette has 112 oranges. How many pitchers of juice can she make?
January 20, 2010

spanish
What does this mean: Cantas en el coro?
January 14, 2010

Statistics
I have to analyze a statistical research paper and have never done so. How do I analyze statistical data and where do I find sources to support my analysis?
January 14, 2010

Social studies
What word means to be the best in trade? None of my notes tell me this
January 13, 2010

Cultural Diversity
when looking for your community would you look up by the town in which you live in
January 12, 2010

Math
A square is inscribed in a circle of radius r. Express the length of the side of the square in terms of r.
January 11, 2010

Calculus
The function f is continuous on the closed interval [1,7] and has values in the table below x f(x) 1 10 4 30 6 40 7 20 Usinf the subintervals [1,4] [4,6] [6,7] what is the trapezoidal apporx. of the integral from 1 to 7 of f(x)dx? The answer: 160 I tried doing each interval as...
January 11, 2010

Calculus
Alright, I found -1/4cos(x)^4 but I didn't get the right answer. Did I dint the wrong anti-derivative? Do I have to do reverse chain rule and get... (-1/4cos(x))sin(x)^4?
January 11, 2010

Calculus
Let F(x) be an antiderivative of sin^3(x). If F(1)=0 then F(8)=? The answer: 0.632 How do I get to that answer? Do I find the antiderivatie and solve for F(x) when x=8?
January 11, 2010

Calculus
If the integral from a to b of f(x)dx=a+2b then integral from a to b of (f(x)+3)dx= ? The answer: 5b-2a How do I get to that answer??
January 11, 2010

Math
If cosx=sqrt{3}/2 and −pi/2<=x<=0 then the exact value of x, in radians
January 10, 2010

elementry math
A box contains three black balls and two gold balls. A ball is selected at random, its color is recorded, and it is then replaced. A second ball is then selected at random and its color recorded. The outcome associated with this type of selection is an ordered pair (first draw...
January 10, 2010

World History
In what ways were the great civilizations of the New World similar to those of the Old World?
January 8, 2010

Chemistry
How do you calculate the molar masses for Strontium Phosphate and Chromium(III)Nitride using significant figures correctly?
January 3, 2010

chemistry
Hi there, I am having a problem with this question, any help would be great. Use the following balanced chemical equation to calculate the mass of carbon dioxide produced from the burning of 5.50 kg of jet fuel which can be represented by the molecule C12H26. You should quote ...
January 2, 2010

5th grade
accb divided by ab
December 16, 2009

education
I don't understand the question or even where to find the answer. I sent an email to the teacher and shes not responding to me.
December 12, 2009

education
Write a 350- to 500-word response to the following: You have the ability to choose three or four books for your students. Based on what you have learned in this course, how can you assess the level of bias and stereotypes in the contents of these texts? What are your criteria...
December 12, 2009

chemistry
Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is sitting on a shelf ...
December 6, 2009

math
aly, its not 8 hrs......
December 3, 2009

physics
three dogs play tug-of-war with a chew toy. Each dog pulls with a force that is horizontal with the ground. Determine the net force acting on the chew toy and the acceleration of the chew toy if its mass is 325g. (ignore friction and gravity) Dog 1 pull: 48.2N at 215 degrees ...
December 3, 2009

Physics
If an object is hung from a cable with a weight of 40 N, what is the tension in the two cables? I got some answers, but it would be best if I knew if I was doing the problems correctly before I do the rest of the worksheet. I did a bunch of work, but it's really messy so I...
December 2, 2009

reading/writing
I have to pick a creative selection such as a painting, political cartoon, or lyrics form a song, poem etc, and I need to complete the following. 1. What observations I can make about this selection 2. What questions can I develop form these observations 3. What prior ...
December 2, 2009

Math
Is 3x-4=12 a linear equation? i know that 3x=16 but would that be considered linear? it would just be a vertical line correct?
December 1, 2009

Calculus
An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 mi/hr. Find the rate at which the angle of elevation is changing when the angle is 30 degrees. I found the answer to be 60 radians/hr by taking the derivative of...
November 19, 2009

Physics
In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a speed of 0.63 m/s?
November 18, 2009

Physics
An astronaut stands on the edge of a lunar crater and throws a half-eaten Twinkie™ horizontally with a velocity of 2.2 m/s. The floor of the crater is 95.4 m below the astronaut. What horizontal distance will the Twinkie™ travel before hitting the floor of the crater...
November 9, 2009

spanish
how do u anwser this question in spanish ¿Qué haces los sábados?
November 7, 2009

English
gxuwer6dydgusawutdfugasufgusgufguageydfusdgfusgdugudgufgdgufsguftutdefuystfugdsudgfudsgugfusdgfusgu
November 3, 2009

math
Find the z-score for the given raw score, mean, and standard deviation. Assume a normal probability distribution. Raw score = 15, ì = 16 , and ó = 2
November 1, 2009

math
Decide which of the variables described is likely to have a normal or near-normal distribution. 3) a. The amount of change held by a teacher at the end of each day for a year b. The amount of property taxes paid by homeowners in a new "affordable housing" subdivision...
November 1, 2009

social studies
unscramble artiotinm
October 30, 2009

math
nevermind
October 27, 2009

math
Given f(x)=x^2, describe (in words) the transformation on f that would produce g(x)=-2(x+4)^2-7?
October 27, 2009

physical
Write one additional audit question for each of the categories (board, staff, donors and fund raisers, clients/customers, volunteers, and society
October 19, 2009

Science
Changes in the environment are monitored by (blank)satellites.
October 19, 2009

Calculus
We are doing problems with the product and quotient rules, but I'm not sure if I'm doing them correctly. If someone could check my answer I would really appreciate it. The original problem was y = (2x-1)^5 * (4x+1)^-1 and I got the derivative to equal y' = [(2x-1)^...
October 13, 2009

Algebra
I am solving X^4-3x^2+2=0 I factored it to be (x^2-2)(x+1)(x-1) as my book suggested. But why is it three sets of parentheses? How do you know that it's supposed to be three sets of parentheses in opposed to two or four? And how come one of the answers according to my book...
October 8, 2009

Algebra
I have to figure out how x^3+216=0 is factored, and what potential solutions might be. I factored it like this: (x+3)(x+3)(x+24), resulting in the solutions being -3 (double route) and -24. But my book says these are not correct answers. Why not? Can you show me how to do it ...
October 8, 2009

Algebra
x^3-3x^2+3x-9=0. My book factors it to x^2(x-3)+3(x-3)=0, but then it magically becomes (x-3)(x^2+3). I have no idea how it became these numbers. Could you explain please? Thanks!
October 7, 2009

Algebra
Why did you square root the second line? Would you please be able to explain? Thanks!
October 7, 2009

Algebra
4x^4-18x^2=0. I have to find out what x equals by factoring. What I did was Factor 2x^2(2x^2+-9)=0 then 2x^2(2x+3)(x+-3), resulting in -1.5 and three. But these answers are wrong according to my book. Can you show me step by step how to do this correctly? It would be a huge help!
October 7, 2009

Science
the term _________________ refers to rain, sleet, or snow that contain acidic compounds.
September 29, 2009

Chem I
Are there any tricks for remembering solubility rules? I am having a hard time remembering which compounds are soluble and which are not. Any suggestions would be appreciated, I just get the soluble/insoluble compounds mixed up sometimes.
September 28, 2009

world history
can you help me with this question? According to the clockmaker analogy did Voltaire believe that God was present in the world?
September 28, 2009

world history
Was plato's ideal form of government philsopher kings.
September 26, 2009

World History
Can you check my answer: Question: What were the key events that shaped Plato's beliefs? My answer: Plato was influenced by Socrates to search for the meaning of life. But after Socrates was executed Plato focused on how society would bring out the best in people.
September 26, 2009

Calculus
How would you find the derivative of f(x)=1/sqrtx using limits? I know how to do problems with a fraction or a square root, but I can't figure out how to do one with both. I have tried a few different starts, but always end up getting stuck.
September 20, 2009

math
Explain Why is1734 greater than175?
September 17, 2009

arithmetic
nth term expressions whose 8th term is 74
September 17, 2009

Calc
Oh! I've seen that equation we just don't call it a derivative. thanks!
September 10, 2009

Calc
what is a derivitive? And how do you get it (f(x)=2x) from f(x)=x^2-3?
September 10, 2009

10th grade math
Try making both 2 and 1 negative
September 10, 2009

10th grade math
Then you would use FOIL, and find which two numbers multiply to get 2, and add to get -3
September 10, 2009

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