Answer

Step-by-step explanation:
Answer:
4
Step-by-step explanation:
b+12 =16
-12. -12
b = 4
hope this helps
Answer:

Step-by-step explanation:
Because we are told equivalent expressions for y and z we can plug those in to 2(y+z).

Then simplify by combining like terms of the expressions. Values ending in x^2 can be combined with each other.

Now we can distribute the 2 by multiplying each value in the parentheses by 2.
