The domain is the whole set of x values, so the domain would go from -infinity to positive infinity. The vertex would be (-5,0) because that is the lowest point on the graph. The Range would include -5 and go up to infinity.
Answer D because you want to get the x by itself and in order to do this she needs to multiply by -4 so that one side only has x.
You solve for x to get your answer each time. For example, the first one. You would isolate the 4x by moving the 10 to the other side by subtracting 10 from both sides. This will give you 4x = -36. Then you divide both sides by 4 to get x = -9.
We always have to remember that the interior angle and its corresponding exterior angle of the hexagon will always add up to 180° Here's an example 120° + 60° = 180°.