Ireally need it! what algebraic property does this statement show? if 7 = x, then x = 7.

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2

Joey is asked to name a quadrilateral that is also a rhombus and has 2 pairs of parallel sides.should be his answer