Lindsey made an error while solving the equation 143.5 = 2 - 7(x + 3). What line has the error?

A.143.5=2-7(x+3)

B.143.5=2+7x-21(step 1)

C.143.5=7x-19(step 2)

D.162.5=7x(step3)

E.23.214=x(step 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?

Which expression is not a polynomial?

Describe the symmetry of the figure. identify lines of symmetry, if any. find the angle and the order of any rotational symmetry.