Match each pair of expressions with the property that can be used to show they are equivalent.
associative
property
distributive
property
additive inverse
property
additive identity
property
linear factor
property
commutative
property
0.9 + 3x + 2.1
and
3x + 2.1 + 0.9
arrowboth
(3x + 2.1) + 0.9
and
3x + (2.1 + 0.9)

3(x + 0.7) + 0.9
and
3x + 2.1 + 0.9

the answer is a.

135 and 80

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.