Question

What is the distance between `P(3,−2,−3)` and `Q(7,0,1)`?

Answer 1

The answer is 6.

`D=sqrt((3-7)^2+(-2-0)^2+(-3-1)^2)`
`=sqrt(16+4+16)`
`=sqrt(36)`
`=6`

Please see the following link for a full explanation and another example:
What is the distance between `M(7,−1,5)` and the origin?