PLS HELP I'M STUCKKK AND PLS EXPLAIN! WILL MARK BRAINLIEST!! :)

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

How do you find the distance of each number from the mean