find the area of the isolated trapezoid below by using the area formulas for rectangles and triangles ​

What number should be added to both sides of the equation to complete this square? x^2-10x=7

What is the quadric regression equation that fits these data

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?