Plz im being timed

the point (8,5) lies on a circle and the center of the circle is at the point (7,5).

what is the equation of this circle?

a. (x - 7)2 + (y - 5)2 = 1

b. (x - 5)2 + (y - 7)2 = 1

c. (x - 7)2 - (y - 5)2 = 1

d. (x - 5)2 - (y - 7)2 = 1

the answeer is a.

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15