Which number is rational?

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?