Hi everyone! I'm taking a math course in the summer( not for a credit just to learn) and I seriously don't get how to do these questions. Can someone please help.

1) A bubble over a set of tennis courts is semi elliptical in cross section, 20m wide at the ground and 8m high in the center. How high is the bubble at a point 2m in from the outer edge. Answer: 4.8m

2) Halley's comet appears to move around the sun, one focus of its elliptical orbit, every 76 years. The major axis of this orbit is 5270 million km and the eccentricity of the orbit is 0.97, where eccentricity is e=c/a

a) find an equation for the orbit

B) find the min distance btw the comet and the sun(the perigee of the orbit)

Answer: 80.5 million km.