Can someone answer. there is a picture. it is only one question. you so much!

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

Which equation is represented by the graph below?