Answer:

Step-by-step explanation:
Solve for x by simplifying both sides of the equation, then isolating the variable.
It has to be b because none of the others are correct.
Answer:
It's the chemical because they have to work with dangerous stuff.
As the exterior angles always add up to 360, you can find the number of sides by dividing 360 by the measure of your exterior angle, 30. This gives you 360/30=12, meaning your polygon has 12 sides.