How was pi discovered mathematically.

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?

Ineed with the quizzes in apex mathematics ii

Solve 17= -13 - 8x and show your work.