A. your two points are (5,9) and (2, 1). find the distance between the two
points.

Root of 73 ~ 8.544

Step-by-step explanation:

d = \sqrt{(x_2 - x_1)^2 + (y_2-y_1)^2}

d=distance

(x_1, y_1)=coordinates of the first point

(x_2, y_2)=coordinates of the second point

That is your formula

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)