Find the area of the quadrilateral with vertices (1,1), (2, 6), (8,5), and (7,2).

Name the quadrilaterals that have four equal sides.

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 expression is equivalent to 42x-56y