Gavin is installing a staircase in his house. The second floor is 10 feet higher than the first floor. Building code requires that the distance from the base of the staircase to the top of the staircase is 15 feet long. How far away from the wall should he start building stairs on the first floor?

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step-by-step explanation:

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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.