Which of the following statements regarding the expansion of (x + y)? are correct?
A. The coefficients of tab and xbyâ are equal.
B. The coefficients of th and yn both equal 1.
O C. For any term xay in the expansion, a-b= n.
D. The coefficients of th – 7 and yn - ? both equal 1.

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed

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.