I need helping figuring out how to do this

Which descriptions refer to fog? check all that apply. burns off when it gets dark forms at or near the ground extends up to 10 miles into the sky found in areas near bodies of water forms when the ground warms at night after a cool, dry day

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)