Which of the following expressions have values that are less than the expression below? 614 : 62

O(63)3
O615 x 6-2
O69 = 6-2
O68 • 6-6
O616 x 6-4

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?

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10