What’s the answer to this

That narrows down the answer choice to Answer D.

Step-by-step explanation:

The green area (the "solution") is above the dashed line y = x + 1; the dashed line is not part of the solution.  This fact eliminates Answers B and C.

The green area is confined on top by the solid line y = 10 or is beneath this line.  That narrows down the answer choice to Answer D.  

In all cases the green area includes the left boundary x = 0.

step-by-step explanation:

im not sure what the answer is

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.