Does anyone understand how to get 9-12

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?