Area of a radius of 19.5

**Answer correctly n ill post another question with extra points**

The equation respenting the left table is

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?

How do you use the elimination method for this question? explain, because i really want to understand!