A:
1 - The bus increases it's journey.
2 - Journey is always the same
3 - The bus decreases it's journey.
4 - Journey is always the same.
5 - Journey decreases a lot.
B:
The function icreases in the part that show a line with a curve going up, decreases in the part that shows a line with a curve going down and the function is consntant when the line is straight and horizontal.
C:
Some parts are linear (the ones that are straight and don't contain any slopes).
Some parts are non-linear (the ones that aren't straight and contian slopes).
Hope it helped,
Happy homework/ study/ exam!