9x 15 what is the answer need

Use the algorithm method. Then multiply. The answer should be 135.

If you don't know what algorithm is, it's when you put a number over a number. And multiply it.

the answer to this question is 3/19

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.