If Main Street Auto Leasing only leases cars and trucks, what is the ratio of cars to the total number of vehicles?

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 percent of the circle below is shaded?

What is the radical expression that is equivalent to the expression 27 1 over 5?