Answer: The amswer is D because -1 + 1 = 0
1) Final expression: 
2) Final expression: 
Step-by-step explanation:
1)
The first expression is

First, we remove the 2nd bracket by changing the sign of all the terms inside:

Now we group the terms with same degree together:

Now we solve the expression in each brackets:

So, this is the final expression.
2)
The second expression is

We apply the distributive property, so we rewrite the expression as follows:

Solving both brackets,

Now we group terms of same degree together:

And solving each bracket,

So, this is the final expression.
Learn how to simplify expressions:
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Answer:
Los pasajeros pasan por el ____.
a.
equipaje
c.
maletero
b.
control de seguridad
d.
mostrador
Step-by-step explanation: