There are 91 lines.
3 lines and one plane
10 lines, but only if no three of them are collinear.
Yes. You can draw infinitely many straight lines from each point.
depends on the position of the points if points are collinear, we have just only one line, the minimum number. If points are in different position (if any of the two points are not collinear) we have 21 lines (7C2), the maximum number of lines.
Any three non-collinear points will define a single plane. A plane is composed of an infinite number of distinct lines.
Not sure about complanar. Coplanar lines can be collinear but need not be.
As long as at least two of them are different points, exactly one line.
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
The definition of a non-collinear line is that this is a line on which points do not lie on one line. The opposite of this is a collinear point. Collinear points refer to three points that do fall on a straight line.