Round 18.238 to the nearest tenth

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?

If m 17 27 90 63 ** picture is attached

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?