What number makes the equation true? Enter the answer in the box. 63 = __ x7 to the answer is 9

Ineed with number 17 i don’t get it at alll

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?

What is the solution set of the quadratic inequality x^2-5< or equal to 0