The definition of a circle uses the undefined term

Which is the graph of the function y=2(4)^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?

43lbs of tomatos cost $387. how much would 41lbs cost