Answer:
yes
Step-by-step explanation:
they are necessary
Work shown above! x = 7
To solve use the supplementary angle next to the unknown angle to find an expression for that unknown angle and use that with the expressions inside the triangle to set equal to 180 and solve for x.
hope this helps c:

go that much "clockwise", you'll end up at the 2nd quadrant,
the reference angle, is its reflective angle on the 1st quadrant
Answer:
1. enlargement by 3 just multiply your x coordinate by 3 and get nine and leave your y just the same
2. just flip your coordinates around using inverse method and you have your answer
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