For requirement 2 & 3 it'll be very helpful if you would please provide me with an explanation on why? or how?.

Prompt: [#.10-102426_fancy-m-png-letter-m-font-style.pngMy friend Martin told me that his favorite point in three-space, M, was a point on the sphere whose center is at (2, -1, 5) and which has a radius of 54/2 . "There are lots of points on that sphere\