Which sum or difference is modeled by the algebra tiles?

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.

where is the graph? need more info

the answer is d

for problems like this theres an app, its photomath that explains the problem and gives the answer hope i