Can you help me?

Problem 1. Find the length between the points (-1, 0, 2) and (3, -2, -3). Problem 2. Find the equation of a sphere that passes through the point P and has center C. A) P = (4,3, -1), C = (3, 8, 1). B) P = (0, 0, 0), C = (1, 2, 3). Problem 3. Show that the equation represents a sphere, and find its center and radius. A) x2 +2 + 22 - 2x - 4y + 82 =15 B) 2x2 + 2y? + 222 = 8.x -24z + 1 Problem 4. Write inequalities to describe the region. The solid upper hemisphere of the sphere of radius 2 centered at the origin