Can someone me with this? i don't understand how to do these & i need to know the answers.

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

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square