Answer:
First Box: Factor by difference of squares
Second Box: It has all perfect squares
Third Box: see my work
Step-by-step explanation:
We have the equation 
Before we do anything, let us bring all of the terms to the left side

Now that we have moved the terms to one side, it is clear that we have a difference of squares.
-Work-

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Answer:b
Step-by-step explanation: a line segment paralle to ab
It's true, assuming that angles 1 and 2 are are at the intersection of line t and l/m
all real numbers is the domain of the function y=x+4
Answer:
b or a
Step-by-step explanation: