In one year how many more hours of sleep does a giant armadillo get than a platypus

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

Answer! if you don’t mind, can you explain

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?