Recent content by staples82

Homework Statement If 100 students take a quiz, use chebyshev's theorem to predict the number of students plus and minus 2 standard deviations from the mean. Homework Equations 1-1/k^2 where k is standard deviations The Attempt at a Solution I think its 75, but I'm not sure...I'm just...

Homework Statement Evaluate each definite integral. ok I'm not sure how to do the integration sign, but... b=4, a=1 for (5yy^.5)+3y^.5)dy Homework Equations The Attempt at a Solution I'm not really sure what I'm doing wrong. i integrated...[tex]5y^2/2*y^(3/2)/(3/2)+3y^(3/2)/(3/2) then i...

Ok, so then that's why e^u/2 is the answer, I think I have to look at a few more problems, see if i can clear it up

I'm wondering why you did du/2=3x^2dx, also how did you get the math text?

Homework Statement Use substitution to find: (3x^2)*(e^2x^3)*(dx) I don't know how to do the integration sign... Homework Equations The Attempt at a Solution u=2x^3 du=6x^2 this is where I got confused, my teacher isn't that good and I'm trying to understand how to...

wouldn't it be: x(dy/dt)+y(dx/dt) for the derivative of xy

So I messed up my product rule of xy then?

Homework Statement Assume x and y are functions of t. Evaluate dy/dt for each of the following. xy-5x+2y^3=-70, dx/dt=-5 x=2 y=-3 Homework Equations n/a The Attempt at a Solution I used x' and y' for dx/dt and dy/dt I found the derivative of the equation, using the product...

First of, thanks for all the help on my previous question, I have another one! 1. Homework Statement Find dy/dx by implicit differentiation: 3x^2=(2-y)/(2+y) 2. Homework Equations n/a 3. The Attempt at a Solution I'm using y'=(dy/dx) I found the derivative of the above...

Homework Statement Find dy/dx by implicit differentiation: 6x^2+8xy+y^2=6 Homework Equations n/a The Attempt at a Solution I'm using y'=(dy/dx) I found the derivative of the above problem. 12x+8xy'+10y=0 (I used the product rule to find the derivative of 8xy') 12x+8xy'+10y=0...

I'm still not grasping the concept, I don't understand where we get 2 from besides when 2-2=0, and you can't divide any number into zero. Also, I'm trying to work other problems, but apparently, it doesn't make sense, such as [5+x]/[x(x-2)], so if I can't change anything as rootX says, how...

Homework Statement Find all values x=a where the function is discontinuous. For each value of x, give the limit of the function as x approaches a. f(x)=[x^2-4]/[x-2] Homework Equations The Attempt at a Solution ok the first thing I did was factored out: (x+2)(x-2)/(x-2), then I...

thank you, dextercioby and Jameson, I understand the problem now.

oh, my bad ...2, so do I plug it back in, sorry I am going into 7th grade, learning this from a book. update: ok I understand what you said, now I have y=2...

yeah, then i got 6y=8