Could you guys help me solve 9 I would appreciate it :)

How can you decide witch operations to use to slice a two step equation

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?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?