xam Class Portion Part 2 (Tests 1 and 2) Chapter 13 1) Find the equation of the sphere passing through P(1, 0, 5) and Q(2 ,3, 9) with its center at the midpoint of the line segment between P and Q. 2) Given u = (-10, 0, 4) and v = (1, 2, 3) calculate the dot product u . v and then find the angle between u and v in radians