The length of a rectangle is 3 m longer than it’s with. if the perimeter of the rectangle is 50 m find the langth and the width

Average acceleration: i have no idea how to do this.

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.

Describe the symmetry of the figure. identify lines of symmetry, if any. find the angle and the order of any rotational symmetry.