What is the slope of (-9,2), (2, -20)

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?

Which of the choices shown could be used to prove that aacp=abcp ?

Add the fractions and simplify 1/2+ 1/3