2 + (x + y) = (2 + x) + y is an example of which algebraic property?

Associative Property of Addition

Step-by-step explanation:

The associative property of addition states that if all the operations are addition, then one can group and add them in whatever order they prefer.

Hope this helps!  Tell me if I'm wrong!

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value