Answer:
x=150
Step-by-step explanation:
Since f is flat, that means that the total degrees will equal 180°.
Therefore, because of the 60° and (x-30)° angles being supplementary angles,
will equal 180.

Yes. You did it right. Most of the angles are corresponding, and once you found the measure of x, you could use the corresponding angles postulate.
6x^2+14x-12 is the answer