Which two expressions are equivalent? * 2 points
21x + 14 and 7(3x + 2)
23x – 14 + 2x and 21x + 14
x + x + 5 and x2 + 5
9x2 + 9x + 5 and 18x2 + 5

step-by-step explanation:

1

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.

a:

step-by-step explanation:

a