What is another name for a regular quadrilateral

Witch represents the inverse of the function f(x)=1/4x-12

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red