exactly one
Two lines in two intersecting planes can be parallel, intersecting, or skew.
One.
If they are straight lines, then they define a plane in which both lines lie.
the answer would have to be skew
Not really. A railroad intersection would be an example of two lines intersecting. An example of two planes intersecting would be the ground and the side of a building or the ground and the railroad crossing sign post.
2
Two lines in two intersecting planes can be parallel, intersecting, or skew.
I'm not entirely certain what you're asking. Any pair of intersecting lines are of necessity coplanar, (assuming Euclidean geometry) though.
Two intersecting straight lines uniquely define one single plane.
Intersecting planes!
Exactly one plane in each case.
Skew Lines. :)
Two intersecting lines can always cover three non-collinear points.
One.
3 intersecting lines, because none of the three points are right angles.
If they are straight lines, then they define a plane in which both lines lie.
intersecting lines