What population density covers most of canada and australia

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2

Where is the map from the question?

There are no put the options so we can assist you ! put it on then i'll answer it ! did you not put the options on intentionally by any chance?

The highest point of a hill (or mountain) is a single point.
a single point can only be precisely marked with a dot. 
putting on a contour line is impossible  on a single point because the contour line is created after multiple points that have the same hight are marked, and after that, all of those points are connected with a line that creates a closed area. so the highest point, as said above, is a single point, there are no other points with the same height, so the only possible way for it to be marked is with a dot, and there is no possibility for a contour line.