6000 apples harvested, every third apple was to small, every fourth apple was too green, every tenth apple was bruised. the remaining apples were perfect. how many perfect apples were harvested.

c

step-by-step explanation:

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.