What is the value of x? 18-7x = -20.5

Arrange these numbers from least to greatest 3/5 5/7 2/9

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 is not true about kl and mn? what is mn? (show your work)