Prealgebra.. examples for each one are commutative property, associative property, additive identity property and additive inverse property.

Step-by-step explanation:

Lets first understand what each of these properties are.

Problem 1

This is an example of the additive inverse property because -2 + 2 = 0.

Problem 2

This is an example of the associative property because the numbers are grouped differently, but still equal each other.

Problem 3

This is an example of the commutative property because the numbers are arranged differently but still equal each other.

the ratio of grapes to blueberries she should use is 12: 3

step-by-step explanation:

if mandie is making 15 cups of fruit salad, the ratio of grapes to blueberries she should use is 12: 3.

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.