Whats 1 + 1 x x +0 - 33333333333333333333333333333333333 333333333333 + 1 x 123478123482398 x0 +1=?

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?

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?