1. Find the distance between (-10,1), (-9,8) A. 2√70
B. 5√2
C. 4√3
D. 2√41

2. Find the midpoint of (-3,5) and (4,-9)
A. (-2, 1/12)
B. (-1/2, 2)
C. (2, -1/2)
D. (1/12, -2)

3. If R is the midpoint of QS, find QS.
x=?
QS=?

Use distance formula:

Correct choice is B

Use midpoint formula:

Correct choice is D, it should read (1/2, -2)

R is midpoint of QS:

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.