True/False and Fill in the Blank statements confusing!

True or False? (these are confusing me...am i right for the ones I answered?)

-7 is a square root of 49 **F**

|-x|=|x| **T**

If PQ = QR, then Q is the midpoint of segment PR.

If a segment is entirely contained in S, then S is a convex set.

If A, B, and C are three collinear points and AB<AC, then A-B-C

On the line PR the coordinate of point P is 17 and the coordinate of R is -6. Then PR = |17-6|. **T**

If two planes are not parallel, they must intersect **T**

If three points are collinear, they are coplanar **T**

A point and a line always lie in exactly one plane. **F**

Fill in the blank w/ always, never, or sometimes (answers by me are bolded)

Two points **sometimes** lie in exactly one plane

Two intersecting lines **sometimes** lie in exactly one plane

Two lines that are not coplanar **never** intersect

A half plane **never** contains its edge

Four points, three of which are collinear, are **never** coplanar

Three lines intersecting in one point are **sometimes** coplanar

Are rays, lines, squares, planes, and circles all a convex set? **YES** <--- is that right?

The intersection of two rays may be a segment? line? ray? point? an empty set? **point** <--- is that right and is it only a point or can it be something else?