Solve for the 12th one

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Explain how you can use the associative property to evaluate (7x50)x4.

What is the value of x in the following equation. -x ^3/2 = -27