The last math test that you took had 100 regular points and 10 bonus points. You received a total score of 87, which included 9 bonus points. What would your score have been without any bonus points? Write an algebraic equation and the solution.

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.

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.