Which graph represents the function r(x) = fx - 21 - 1

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?

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Match the one-to-one functions with their inverse functions.