4. Show that Polygon A is congruent to Polygon B.

A is equivalent to B because if you flip or reflect A, then translate A it overlaps.  

1. Draw A's reflection below it: as if you flipped it.

2. Take the drawing and draw it mirroring B

3. Once you draw the second drawing if you moved, translated, it it would fit over the shape of the B polygon.

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.