Geometry 70 points ! find surface area. it’s okay if you did one but i would prefer if you did both

Arectangular exercise mat has a perimeter of 36 feet the length of the mat is twich the width writeand solve an equation to determine the length in feet. of the mat then find the area in square feet of the mart

Guests at an amusement park must be at least 54 inches tall to be able to ride the roller coaster. which graph represents the set of heights that satisfy this requirement?

Me with this one question, and i'll upvote the brainliest answer