47 + 3x+10=9x-39 what is x ?

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?

Which of the following is not a subset of {1,2,3}?

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3