• ### Statistics help finding variance?

Alright, I'm having trouble figuring this one out. I'm given a table specifying some information and asked to find the unknown values. The information given is as follows: variable: X N: 10 Sum: 109.891 Sum of Squares: 1258.899 Minimum: 6.451 Maximum: 13.878 And I am asked to find the mean and the variance. I found the mean to be... show more
Alright, I'm having trouble figuring this one out. I'm given a table specifying some information and asked to find the unknown values. The information given is as follows: variable: X N: 10 Sum: 109.891 Sum of Squares: 1258.899 Minimum: 6.451 Maximum: 13.878 And I am asked to find the mean and the variance. I found the mean to be 10.9891 by dividing the sum by the number of observations but I have no idea how to find the variance. Any help would be GREATLY appreciated! Thank you all in advance!
1 answer · Mathematics · 6 years ago
• ### Quick chemistry question with molarity?

Hello all, this one shouldn't be much trouble for someone who knows what they're doing but I'm having trouble with it. So here's the question: an acid solution is 0.100 M in HCl and 0.200 M in H2SO4. What volume of a 0.150 M KOH solution would have to be added to 500.0 mL of the acidic solution to neutralize completely all of the... show more
Hello all, this one shouldn't be much trouble for someone who knows what they're doing but I'm having trouble with it. So here's the question: an acid solution is 0.100 M in HCl and 0.200 M in H2SO4. What volume of a 0.150 M KOH solution would have to be added to 500.0 mL of the acidic solution to neutralize completely all of the acid? Any help would be greatly appreciated! Thank you all in advance! Also, I will choose a best answer. Thanks again!
1 answer · Chemistry · 7 years ago
• ### Chemistry question concerning hydrate?

I'm not really sure how to go about this one so any help would be incredible. The question is as follows: a hydrate of copper (II) chloride has the formula CuCl2.xH20. The water in a 3.41 g sample of the hydrate was driven off by heating. The remaining sample had a mass of 2.69 g. Find the number of waters of hydration (x) in the hydrate. I... show more
I'm not really sure how to go about this one so any help would be incredible. The question is as follows: a hydrate of copper (II) chloride has the formula CuCl2.xH20. The water in a 3.41 g sample of the hydrate was driven off by heating. The remaining sample had a mass of 2.69 g. Find the number of waters of hydration (x) in the hydrate. I worked with this for a while and got two different answers (2 and 4). If you could show me the correct steps it would be greatly, greatly appreciated. Thank you all in advance!
4 answers · Chemistry · 7 years ago
• ### Trying to remember long division of polynomials?

Hello all, I haven't worked with free hand long division is many years since I've been working with calculators and the like. I've been trying to recall how to do it by hand though. Guidance would be greatly appreciated. If you could please explain how to do something like the following: (x^4+12x^3+15x^2+25x+11)/(x^3+12x^2+11x) that... show more
Hello all, I haven't worked with free hand long division is many years since I've been working with calculators and the like. I've been trying to recall how to do it by hand though. Guidance would be greatly appreciated. If you could please explain how to do something like the following: (x^4+12x^3+15x^2+25x+11)/(x^3+12x^2+11x) that would be incredible. Thank you all in advance!
1 answer · Mathematics · 7 years ago
• ### Calculus II question involving integrals. Help would be greatly appreciated!?

Here's the question: estimate the definite integral from 0 to 3 of f(x)g'(x)dx if f(x)=x^2 and g(x) has the values given in the following table. x-------0----0.5---1---1.5--2--2.5---3 g(x)--1.5--2.3--2.4--2.9--3--3.8--4.8 I'm having a lot of trouble figuring out how to go about this using either substitution or parts and I am lost!... show more
Here's the question: estimate the definite integral from 0 to 3 of f(x)g'(x)dx if f(x)=x^2 and g(x) has the values given in the following table. x-------0----0.5---1---1.5--2--2.5---3 g(x)--1.5--2.3--2.4--2.9--3--3.8--4.8 I'm having a lot of trouble figuring out how to go about this using either substitution or parts and I am lost! Any help would be awesome! Thank you all in advance! P.S. Sorry, tables are difficult to construct on here
2 answers · Mathematics · 7 years ago
• ### Question on a definite integral for Calculus II?

I've been working on this one for a bit now and I've been having little luck. The question is this: find the definite integral of [cos(x^(1/5))]/[x^(4/5)]dx evaluated from 1 to 32. Any help or guidance would be extremely appreciated! Thank you all in advance!
I've been working on this one for a bit now and I've been having little luck. The question is this: find the definite integral of [cos(x^(1/5))]/[x^(4/5)]dx evaluated from 1 to 32. Any help or guidance would be extremely appreciated! Thank you all in advance!
2 answers · Mathematics · 7 years ago
• ### Simple Physics Torque Question?

Evidently there are two things that must be true in order for a "see-saw" to be in equilibrium. What are those two required things? Any insight would be greatly appreciated! Thank you all in advance!
Evidently there are two things that must be true in order for a "see-saw" to be in equilibrium. What are those two required things? Any insight would be greatly appreciated! Thank you all in advance!
6 answers · Physics · 7 years ago
• ### Is it possible to have an inelastic collision where the objects stuck together have a velocity that's opposite?

Is it possible to have an inelastic collision where the objects stuck together have a velocity that's opposite to the initial velocity?
Is it possible to have an inelastic collision where the objects stuck together have a velocity that's opposite to the initial velocity?
1 answer · Physics · 7 years ago
• ### Calculus Optimization?

I'm completely lost on this one so any help would be greatly appreciated. The problem goes as follows: A rectangle has one side on the x-axis of a coordinate plane and two vertices on the curve y=7/(4+x^2) Find the vertices of the rectangle with maximum area. If you could help me out and show me the steps that'd be awesome! Thank you all... show more
I'm completely lost on this one so any help would be greatly appreciated. The problem goes as follows: A rectangle has one side on the x-axis of a coordinate plane and two vertices on the curve y=7/(4+x^2) Find the vertices of the rectangle with maximum area. If you could help me out and show me the steps that'd be awesome! Thank you all in advance!
1 answer · Mathematics · 7 years ago
• ### Derivative of a^(x+1)?

How do you find the derivative of a function in the form of a^(x+1)? I'm solving for the function (ln3)^(cosx) and don't recall how to differentiate. Any help would be greatly appreciated! Thank you all in advance!
How do you find the derivative of a function in the form of a^(x+1)? I'm solving for the function (ln3)^(cosx) and don't recall how to differentiate. Any help would be greatly appreciated! Thank you all in advance!
1 answer · Mathematics · 7 years ago
• ### Quick calculus question: derivatives?

Hello all, I'm a little bit rusty on some of my derivative rules and I forget how to get the derivative of a function in the form of a^(x+1). I recall that the derivative of a^x is ln(a)a^x but I forget about when the exponent in this form. If you could direct me towards the correct way of doing this that would be great. Any help would be... show more
Hello all, I'm a little bit rusty on some of my derivative rules and I forget how to get the derivative of a function in the form of a^(x+1). I recall that the derivative of a^x is ln(a)a^x but I forget about when the exponent in this form. If you could direct me towards the correct way of doing this that would be great. Any help would be greatly appreciated! Thank you all in advance!
1 answer · Mathematics · 7 years ago
• ### Calculus derivative question: in form ca^x?

I'm attempting to finish my calculus homework but I'm having trouble figuring out a few of the problems. All of the problems are in the form of c*a^x where c and a are both constants. I know how to find the derivative of a^x but I am unsure when there is the constant c. An example problem is as follows: 103(.01)^x. Any help here would be... show more
I'm attempting to finish my calculus homework but I'm having trouble figuring out a few of the problems. All of the problems are in the form of c*a^x where c and a are both constants. I know how to find the derivative of a^x but I am unsure when there is the constant c. An example problem is as follows: 103(.01)^x. Any help here would be great! Thank you all in advance!
2 answers · Mathematics · 7 years ago
• ### Quick physics question: how to find the angle of a 3-dimensional vector?

Given the unit-vector notation of a vector: 1i-(.5)j+(.75)k what is the angle between the vector and the positive x-axis? Any help with this would be great guys! Thank you all in advance!
Given the unit-vector notation of a vector: 1i-(.5)j+(.75)k what is the angle between the vector and the positive x-axis? Any help with this would be great guys! Thank you all in advance!
1 answer · Physics · 7 years ago
• ### Need some slower "dubstep"?

Hey everyone, I am really in the mood for some good dubstep but more specifically something a little slower or mellower. I am fairly new to the genre of dubstep so I'm still finding artists etc. Songs that I'm thinking of are like "Cracks" by Flux Pavilion and "Where'd You Go" by Murdok. Any tips or ideas would be... show more
Hey everyone, I am really in the mood for some good dubstep but more specifically something a little slower or mellower. I am fairly new to the genre of dubstep so I'm still finding artists etc. Songs that I'm thinking of are like "Cracks" by Flux Pavilion and "Where'd You Go" by Murdok. Any tips or ideas would be excellent and appreciated. Thank you all in advance!
1 answer · Other - Music · 7 years ago
• ### How do I determine instantaneous velocity for the graph of x=9.75+1.50t^3?

I'm given the equation x=9.75+1.50t^3 where x is the position of a particle (in centimeters) and t is the time (in seconds). I am supposed to find the instantaneous velocity of the particle at time t=2 seconds and t=3 seconds. It's been a long time since I've done problems like this and am quite rusty so any help or advice would be... show more
I'm given the equation x=9.75+1.50t^3 where x is the position of a particle (in centimeters) and t is the time (in seconds). I am supposed to find the instantaneous velocity of the particle at time t=2 seconds and t=3 seconds. It's been a long time since I've done problems like this and am quite rusty so any help or advice would be great! Thank you all in advance!
3 answers · Mathematics · 7 years ago
• ### Quick and easy calculus question?

Is the following function continuous on [-1,1]: f(x)={x/(absolute value (x)) when x does not equal 0} {0 when x=0 } This should be very easy but I can't quite make up my mind. Any help would be great! Thank you all in advance!
Is the following function continuous on [-1,1]: f(x)={x/(absolute value (x)) when x does not equal 0} {0 when x=0 } This should be very easy but I can't quite make up my mind. Any help would be great! Thank you all in advance!
3 answers · Mathematics · 7 years ago
• ### How do you solve 5e^(6x)=7e^(9x)?

I'm confused on this one. I took it this far: (please correct me if I'm wrong) 5(6xlne)=7(9xlne) 5(6x*1)=7(9x*1) 30x=63x This does not make sense so any help or guidance would be excellent. Thank you all in advance!
I'm confused on this one. I took it this far: (please correct me if I'm wrong) 5(6xlne)=7(9xlne) 5(6x*1)=7(9x*1) 30x=63x This does not make sense so any help or guidance would be excellent. Thank you all in advance!
6 answers · Mathematics · 7 years ago
• ### How do you solve 3^x=e^(x+4)?

Hey guys, I don't know how to solve this one or even how to start it so any help or guidance would be extremely helpful and extremely appreciated. Thank you all in advance!
Hey guys, I don't know how to solve this one or even how to start it so any help or guidance would be extremely helpful and extremely appreciated. Thank you all in advance!
4 answers · Mathematics · 7 years ago
• ### Modern Warfare 3: Prestige Edition?

So far Infinity Ward (and Treyarch for Black Ops) has released a prestige edition for their Call of Duty games which included lots of extras. Does anyone know what will be included in the Modern Warfare 3 Prestige Edition? (Assuming that they make one)
So far Infinity Ward (and Treyarch for Black Ops) has released a prestige edition for their Call of Duty games which included lots of extras. Does anyone know what will be included in the Modern Warfare 3 Prestige Edition? (Assuming that they make one)
5 answers · Video & Online Games · 8 years ago
• ### Any ideas for some good music?

I'm currently looking for some new music/bands. What I am really in the mood for is some fast-paced techno that is not too repetitive. Also there's something that I've been looking for for awhile now: I love the blast beats and precise measures of heavy metal music but lately I've been digging clean (lighter) vocals and I've been... show more
I'm currently looking for some new music/bands. What I am really in the mood for is some fast-paced techno that is not too repetitive. Also there's something that I've been looking for for awhile now: I love the blast beats and precise measures of heavy metal music but lately I've been digging clean (lighter) vocals and I've been having a hard time finding something that satisfies me. Any help with this or any other ideas of just some great music would be hugely appreciated. Thank you all in advance!
7 answers · Other - Music · 8 years ago