Thursday

March 26, 2015

March 26, 2015

Total # Posts: 377

**Calculating Chi Squared**

did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light wavelength. For the ...
*October 30, 2011*

**Calculating Chi Squared**

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light wavelength. For the ...
*October 29, 2011*

**Statistical significance (Chi squared)**

I just want to make sure what I'm calculating this right. The data I got for one time point are 6 and 23 I know the equation for chi^2 is Calculating Chi Squared - Catherine, Friday, October 28, 2011 at 8:15pm I did a biology experiment where I need to analyze the ...
*October 29, 2011*

**Calculating Chi Squared**

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light wavelength. For the ...
*October 28, 2011*

**Calculating Chi Squared**

I did a biology experiment and I have to use the chi^2 method to calculate statistical significance. I got data at different time points and I just want to make sure what I'm calculating this right. The data I got for one time point are 6 and 23 I know the equation for ...
*October 28, 2011*

**Statistical significance**

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light wavelength. Forthe ...
*October 28, 2011*

**Statistical significance**

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light wavelength. Forthe ...
*October 27, 2011*

**Statistical significance**

I did a biology experiment where I need to analyze the statistical significance of betweeen a data set. My experiment consisted of measuring the effects in photosynthesis and cellular respiration by exposing solutions with leaf discs to different light wavelength. Forthe ...
*October 27, 2011*

** english**

I need to do a summary paragraph on a ediorial in a newspaper or magazine .and i dont were to start in writing the paragraph and the subject i choose waw sex,slavery in america on one girls nightmare
*October 10, 2011*

**math**

1500 and 1800
*October 5, 2011*

**algebra**

2(a-4)=-2 a-4=-1 a=3
*October 2, 2011*

**Biology**

explain the progression of the atmosphere from prebiotic to its current makeup
*October 2, 2011*

**arithmetic**

State whether the following sequence is arithmetic, geometric, or neither. 10, 10.25, 10.50625, 10.76890625, .... (Points : 1) arithmetic sequence geometric sequence neither
*October 2, 2011*

**math**

A store mixes Kenyan Coffee worth $11 per Kilogram and venezuelan coffee worth $14 per Kilogram. The mixture is to sell for $12 per kilogram. Find out how much of each should be used to make a 396-Kilogram Mixture
*September 27, 2011*

**Ciollege algebra**

Suppose that X liters of 38% acid solution are mixed with y liters of a 42% solution to obtain 100L of a 39% solution. One equation in a system for solving this problem is x+y=100. Which one of the following is the other equation? A. 42x+38y=0.39*100 B 0.38x+0.42y=0.39*100 C. ...
*September 27, 2011*

**math**

Simplify and write each variable as an expression with positive exponents: ((-24x^9)/(8b^7))^4 = c((x^m)/(b^n))
*September 21, 2011*

**Math**

Jake is planning to fence his garden. His garden is 10 feet long and 5 feet wide. What is the amount of area Jake wants to fence? Is this a perimeter or area question? That's all I need.
*September 18, 2011*

**Calculus**

Yes, you are right Thanks, I just found it! =)
*September 15, 2011*

**Calculus**

Please help? Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis). Find the formula for F(a).
*September 15, 2011*

**Calculus**

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis). Find the formula for F(a).
*September 14, 2011*

**Mechanics**

A tension test was performed on a steel specimen having an original diameter of 12.5 mm and gauge length of 50 mm. Using the data listed in the table, plot the stress–strain diagram, and determine approximately the modulus of toughness. Use a scale of 20 mm-50 MPa and 20 ...
*September 10, 2011*

**Calculus**

Sorrr, I didn't ask what to find. I have to Find the formula for F(a).
*September 10, 2011*

**Calculus**

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis).
*September 10, 2011*

**Calculus**

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis). Find a formula for F(a).
*September 9, 2011*

**Math**

what algebra
*September 4, 2011*

**Geography**

I didn't find much... But I did find the Balcones Escarpment! Is that right?
*August 30, 2011*

**Geography**

What are some major landforms by Wichita Falls, Texas?
*August 30, 2011*

**math**

I think it's 44 if you mean add the 2 digits together to get the summ.
*August 24, 2011*

**MATH HELP!!!!!!! :(**

This is a riddle, and I'm supposed to find a 5-digit number from it..... My thousand's digit is the first that is perfect, but if you're not happy with that, it's also the product of the first two primes. My units digit is the odd of those two primes, and if ...
*August 24, 2011*

**Coordinate system**

XComplete the table of values for the equation 8x+2y=80 xy 0? ?0 2? that is what I got so far, please help me get the rest
*July 19, 2011*

**Linerar Equations in 2 Variables**

Complete the ordered pair for the equation y=-10x+18 I have one of the ordered numbers given to me by my instructor, I have to come up with the first one, this is excactly hwo he gave it to me, but I really dont understand this...Can someone please help me understand it better...
*July 19, 2011*

**Basic Algebra**

A new cruise ship line has just launched 3 new ships: the Pacific Paradise, The caribbean paradise, and the mediterranean paradise. The carribean paradise has 32 more deluxe stateroooms than the pacific paradise. The Mediterranean paradise has 37 few deluxe staterooms than ...
*July 16, 2011*

**Basic Algebra**

Thanks for the help :)
*July 16, 2011*

**Basic Algebra**

solve the equation m, and check the solution: 5/6x-1/5x+4=7/10x
*July 16, 2011*

**Basic Algebra**

solve the equation: 16((3x+7)=4(12x+8)
*July 16, 2011*

**Basic Algebra**

solve. Cx+Hy=M, for x
*July 12, 2011*

**Basic Algebra**

A box to hold pencils measures 5.8 inches by 5 inches by 4 inches high. Find the volume of the box.
*July 12, 2011*

**Basic Algebra**

if 5 is added to a number and the sum is tripled, the result is 27 more than the number. Find the number
*July 10, 2011*

**Basic Algebra**

solve the equation & check your solution: 2/5x-9/25x=5
*July 9, 2011*

**Basic algebra**

Solve the equation: 3(-2x+1)=-5(x+1)
*July 9, 2011*

**Basic Algebra**

I have to solve the following equation and check my work. Not sure how to do this if someone oculd help me out. The problem is (17b-5)-8(2b+4)=-6
*July 9, 2011*

**Basic Algebra**

I am having a hard time trying to figure out this problem, if someone could help me...I'd appreciate it: I have to solve the problem 7x-(6x+4)=4
*July 9, 2011*

**trig**

find the least positive value of @. sec (4@+10)cos(3@+17) @=theta
*May 23, 2011*

**Physics Year 7 (Help please)**

Isabella drops a chunk of iron of mass m from the roof of her high school and it accelerates at g. Then she ties two chunks of iron together of mass 2m. Show that when she drops the double chunk, the acceleration of fall is also g. Thank you :)
*May 15, 2011*

**Science**

What two major factors determine the size of a star? Is it a) Gravity and Mass OR b) The force of gravity pulling in trying to make the star as small as possible and the outward pressure from the radiation generated in the core trying to swell it up. Thanks :) Because I'm ...
*May 14, 2011*

**Science**

By what factor would your weight change if the earth's diameter were doubled and its mass were also doubled? Thanks :)
*May 14, 2011*

**Science**

What are two competing effects that determine the size of the star? Please keep the answer short and thank you.
*May 14, 2011*

**Physics**

Just wanted to thank you for answering all my questions even though I was clearly lost during most of this process... I finally got it... Thanks =D
*May 8, 2011*

**Physics**

Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
*May 8, 2011*

**Physics**

So is the period 8222 s? I still don't get why the ansser for the aphelion is wrong...
*May 8, 2011*

**Physics**

Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
*May 8, 2011*

**Physics**

Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
*May 8, 2011*

**Physics**

For a scene in a movie, a stunt driver drives a 1.50x10^3 kg SUV with a length of 4.35 m around a circular curve with a radius of curvature of 0.333 km. The vehicle is to be driven off the edge of a gully 10.0 m wide, and land on the other side 2.96 m below the initial side. ...
*May 8, 2011*

**Physics**

You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a technician, you find yourself...
*May 8, 2011*

**Physic**

A 3.8 kg object is supported by an aluminum wire of length 1.9 m and diameter 2.2 mm. How much will the wire stretch?
*May 7, 2011*

**Physics Question**

Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth : An oak barrel with a lid of area 0.17 m^2 is filled with water. Along, thin tube of cross-sectional area 4.7×10−5 m^2 is inserted into a hole at the ...
*May 7, 2011*

**Physics**

I'm sorry, I don't understand, you mean this equation: P = 2pi sqrt[R^3/(GM)] won't a be 12,345?
*May 7, 2011*

**Physics**

Thanks, I now get 5481 seconds for the period, then I have to multiply that by 1.5 right? I get 8222 s When you say substitute a for R, you meant for the equation of the aphelion?
*May 7, 2011*

**Physics**

I must be doing something wrong because I typed the answers for a second time and they are wrong, I have only one attempt left, can you please check what I did wrong? For the period what I did was P = sqrt(R^3(4pi^2)/GM) P = sqrt ((6720^3(4pi^2)/(6.674E-11(5.9742E24))) P = 0....
*May 7, 2011*

**Physics**

You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a technician, you find yourself...
*May 7, 2011*

**Physics**

I must be doing something wrong because I typed the answers for a second time and they are wrong, I have only one attempt left, can you please check what I did wrong? For the period what I did was P = sqrt(R^3(4pi^2)/GM) P = sqrt ((6720^3(4pi^2)/(6.674E-11(5.9742E24))) P = 0....
*May 6, 2011*

**Physics**

So will the aphelion be the perihelion + 2a = 31,410 km?? In order to calculate the period, won't I need the velocity?
*May 6, 2011*

**Physics**

I'm sorry, you are right, I omitted some words, here is the question: You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
*May 6, 2011*

**Physics**

You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a technician, you find yourself...
*May 6, 2011*

**Social Studies**

Oh....... true. Thanks!!
*May 4, 2011*

**Social Studies**

Um..... I thought it was because he was the symbol of preventing wildfires, but I thought it had to be bigger than that. I know he is trying to promote stopping wildfires to save our ecosystem, but the popularity question confuses me. I mean, I pretty much know, but I can'...
*May 4, 2011*

**Social Studies**

Why has Smokey the Bear been popular for so long? What does he try to promote?
*May 4, 2011*

**Physics**

A beam, B1, of mass M1 = 0.6887 kg and length L1=1 m is pivoted about its lowest point at P1. A second beam, B2, of mass M2=0.200 kg and length L2=0.200m is suspended (pivoted) from B1 at a point P2, which is a horizontal distance d=0.550, from P1. To keep the system at ...
*May 2, 2011*

**MGT 330**

Extrinsically motivated
*May 1, 2011*

**Physics (please help)**

A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true? a. None of the other statements are true. b. There is only one force acting on the planet. c. There are two forces acting on the planet and ...
*April 30, 2011*

**English-CHECK PLEASE**

Ohh.............. Thanks! i get it!
*April 15, 2011*

**English-CHECK PLEASE**

Ok, I figured this out (I think) but can you please check? Don't worry. I can carry the tent all by myself because it is so light. I do not even need a lantern it is so light outside. In these sentences, the word "light" is used as a: A:homophone B:homonyme C:...
*April 15, 2011*

**Calculus (urgent!!)**

A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the particle comes to a ...
*April 15, 2011*

**Calculus (pleas help!!!)**

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
*April 15, 2011*

**Calculus (please help!!!!)**

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
*April 14, 2011*

**Calculus (urgent!!)**

Ok..I found the problem with my first part, I accidentally typed cost(t)^2... Ok I'm still stucked with the last two parts, I don't know what to do with them....
*April 14, 2011*

**Calculus (urgent!!)**

A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the particle comes to a ...
*April 14, 2011*

**Calculus (please help!!!)**

I typed 0 for the time, since it was at (0,1) when it started, and slected yes for part c, I have part A and B wrong, I don't know how to write the intervals from part A and I didn't see any counter-clockwise motion... please explain...
*April 14, 2011*

**Calculus (please help!!!)**

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
*April 14, 2011*

**Calculus**

What I thought that I had to do was to take the derivative, (2/x)/2x and then plug in 2... and that's how I got 1/4, but that's not the answer, what do I have to do?
*April 13, 2011*

**Calculus**

I thought that it was 1/4 but that's now the answer....
*April 13, 2011*

**Calculus**

Find the limit: lim x-> 2 ln(x/2)/ (x^2−4) Can someone help me with this?
*April 13, 2011*

**English**

I just typed the passage. My assignment is to make a high level (8th grade) question for the passage. What do you mean by my analysis?
*April 13, 2011*

**English**

What are some high level questions about the moon? Please put at least 4. What are some high level questions for this passage? There was once a sheperd who loved his sheep but was growing tire of caring for them. One hot day, he sat down under a tree and pondered what to do ...
*April 13, 2011*

**English**

thanks!
*April 7, 2011*

**English**

What are the steps for editing?
*April 7, 2011*

**Calculus (urgent!!)**

Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if you are asked to ...
*April 6, 2011*

**Calculus (pleas help!!!)**

Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if you are asked to ...
*April 5, 2011*

**Calculus (pleas help!!!)**

Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if you are asked to ...
*April 5, 2011*

**Calculus**

Find the global maximum and minimum values of f(t)=4t/(2+t^2) if its domain is all real numbers?
*April 5, 2011*

**Math-REALLY CONFUSED**

On the worksheet it showed an example, and for a quadrilateral it showed only 1 diagonal, so it didn't do all the diagonals or it would be 2, so I did only the diagonals from one corner, which is 4. I just now divided 900 by 7,(using a calculator) and the answer was 128....
*March 21, 2011*

**Math-REALLY CONFUSED**

Thanks. Yeah I tried 900 divided by 7, but it kept going on and on and on and on and on. Unless I calculated wrong.
*March 21, 2011*

**Math-REALLY CONFUSED**

Ok, so this worksheet says that a regular heptagon has 7 sides. So, would it have 7 angles, 4 diagonals, 5 triangles, and that the angle sum of the figure is 900 degrees. Am I right on those? But then it says to find the "Measure of each angle". Wouldn't it would...
*March 21, 2011*

**separation of variables**

if dy/dx=-3y and y=1 when t=0, what is the value of t for which y=1/3?
*March 19, 2011*

**separation of variables**

find an equation of the curve that passes through the point (1,1) and whose slope at (x,y) is y^2/x^3
*March 19, 2011*

**Calculus (pleas help!!!)**

A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find the y-value for ...
*March 16, 2011*

**Calculus Please Help**

I see what is wrong with my equation... now I have (-2x+y^2)/(3y^2-x2y) and for the second part I tried to plug 1 for x and all the other values for y and then in the third part I plugged 2 for y and 0.96 for x and I got them all wrong: my values are: 0.96 = -1.2765 0.98= -1....
*March 15, 2011*

**Calculus Please Help**

In the first part... I got (-2x+y^2)/(3y^2+x2y) but apparently that's wrong which will make everything else wrong.... I just need to know how to do that part right...
*March 15, 2011*

**Calculus Please Help**

A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find the y-value for...
*March 15, 2011*

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