ΔACB and ΔMNB are similar. Therefore the corresponding sides are in proportion:

Substitute:

Your answers are correct. Q3 Is > and Q4 is <
Variables represent unknowns. They are often letters (like x) but can also be other symbols like Greek numerics.
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Answer:
All you have to do is just add the numbers inside the parenthesis. (4+-2) is the same as 4-2 which is equal to 2. (4+-6) is the same as 4-6 which is equal to -2.
Step-by-step explanation:
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