If cos(θ) = 1/18 with θ in quadrant i, what is sin(θ)?

Does anyone know of a quizlet or something for edmentrum /plato algebra 1

Which of those sequences is a geometric sequence

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?