13 divided by 2 is 6.5 and 31 divide by 2 is 15.5 I hope this helped
Answer: Choice B
Work Shown:

This says that x is between 1 and 4; it can equal 1, but it can't equal 4.
To visually represent this, we'll have a closed circle at 1, an open circle at 4, with shading in between these circles. This is represented by graph B.
A regular hexagon has 3 pairs of parallel sides. A regular octagon has 4 pairs of parallel sides. Hope this helps :))
The answer to this should be C
0,0 represent origin or rather it called origin