What do rectangles and parallelograms have in common? A.
They are quadrilaterals that have four square corners.
B.
They are quadrilaterals that have two square corners.
C.
They are quadrilaterals that have all four sides equal in length.
D.
They are quadrilaterals that have opposite sides equal in length.

They are quadrilaterals that have opposite sides equal in length.

D. They are quadrilaterals that have opposite sides equal in length.

Step-by-step explanation:

Rectangles and parallelograms both have 2 sets of parallel sides.  The parallel sides are of equal length.

Rectangles are special parallelograms that have 2 sets of corners that have 90 degree angles

Squares are special rectangles that have all 4 sides of equal lengths.

step-by-step explanation:

there's the chart

1. a^4+8a^3+24a^2+32a+16

2.y^8+8y^7+28y^6+56y^5+70y^4+56y^3+28y^2+8y+1

3.x^6-3x^4y^2+3x^2y^4-y^6