What is meant by "dot product between random variables?"
I was having a discussion with a colleague today about correlation coefficients, and I was told that correlation coefficient between 2 random variables $X...
Apr 18, 2026 1 VIEWS
Topic: General
5104 Articles 
General Principles of Solving Radical Equations
What are the general ways to solve radical equations similar to questions like $\sqrt{x+1}+\sqrt{x-1}-\sqrt{x^2 -1}=x$ $\sqrt{3x-1}+\sqrt{5x-3}+\sqrt{x-1}...
Apr 18, 2026 1 VIEWS
Expected Value of Random Walk
Can someone very simply explain to me how to compute the expected distance from the origin for a random walk in $1D, 2D$, and $3D$? I've seen several...
Apr 18, 2026 2 VIEWS
Finding linear dependence relations among vectors [closed]
I have a set of row vectors: $$\begin{matrix} 3 &6 & 0 \\ 4 & 7 &0 \\ 5 &8 & 0 \\ \end{matrix}$$ I know that if we're able to...
Apr 18, 2026 1 VIEWS
What is the relation between height and radius of base of a right circular cone when its surface area is given and volume is to be maximum?
$r$ - radius of base $h$ - height of cone $l$ - slant height of cone $V$ - Volume of cone $A$ - surface area of cone First of all I myself don't know...
Apr 18, 2026 1 VIEWS
How to find quadratic function in vertex form from two points?
I'm starting to learn about quadratic formulas in math class. This question came up in a homework packet: A WNBA player takes a three-point shot 22 f...
Apr 18, 2026 1 VIEWS
In ZFC, which axioms of set are not required to class?
In Set Theory , Thomas Jech says Classes Although we work in ZFC which, unlike alternative axiomatic set theories, has only one type of object, namely set...
Apr 18, 2026 1 VIEWS
how to calculate surface area of rectangular prism with given volume
I am doing a math project on optimisation and have a rectangular prism with a volume of 100cm3 but no other information. I am supposed to analyse whether ...
Apr 18, 2026 1 VIEWS
Why is $\tan((1/2)\pi)$ undefined?
Why is the trigonometric function $\tan((1/2)\pi)$ undefined?
Apr 18, 2026 1 VIEWS
Cartesian equation of a parametric curve
I am trying to find the cartesian equation of the parametric curve $$x = 1-t^2, \qquad y = t-2, \qquad -2 \leq t \leq 4$$ I am not sure how to proceed but...
Apr 18, 2026 2 VIEWS
Fixed point iteration method $x_{n+1}=g(x_n)$ doubt .
I have a doubt regarding fixed point iteration method for $f(x)=0$ for a zero of $f$ in $[a,b]$. We write it in equivalent form like $$g(x)=x$$ Now I stud...
Apr 18, 2026 1 VIEWS
Newton vs Leibniz notation
I have often come across the cursory remarks made here and there in calculus lectures , math documentaries or in calculus textbooks that Leibniz's no...
Apr 18, 2026 1 VIEWS