I have read several explanations of standard deviation and z-score, I know how to it calculate them but I am not sure what is differences betwen them. Can...

I want to factorize the polynomial $x^3+y^3+z^3-3xyz$. Using Mathematica I find that it equals $(x+y+z)(x^2+y^2+z^2-xy-yz-zx)$. But how can I factorize it...

I have come across many papers which reference the Jacobian when solving certain finite difference inverse problems. And I have seen many articles and tex...

the expression is $(a-b)c^3+(b-c)a^3-(a-c)b^3$ I've tried factoration by grouping, but it has been a trial and error situation. I don't know any...

How would you write a fraction in binary numbers; for example, $1/4$, which is $.25$? I know how to write binary of whole numbers such as 6, being $110$, ...

This is for a project which I've been trying to find some information for Covariance matrix and correlation matrix. I understand that for a $n \times...

Apparently $E[X] = E[E[X\mid Y]]$ but I don't understand what this really means. I looked at https://en.wikipedia.org/wiki/Law_of_total_expectation b...

I want to solve a Lagrange multiplier problem, $$f(x,y) = x^2+y^2+2x+1$$ $$g(x,y)=x^2+y^2-16 $$ Where function $g$ is my constraint. $$f_x=2x+2, \ \ \ f_y...

We know $y=mx+c$ is the equation for a straight line in a 2D graph. And the parallel line that goes through $(x_1,y_1)$ is $y=mx+(-mx_1+y_1)$. But how do ...

Draw a circle with center O. Line AD is a chord that is 8cm long. The arc above is smaller than the one below. B is the center of AD. Line CB is a line th...