Write three expressions that are equivalent to 2x+4c-15

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 border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Three times the sum of a number and seven is negative thirty-six. what is the number?