Select all of the following that are quadratic equations. x2 + 3 x -5 = 0
x2 - x = 3 x + 7
5 x - 7 = 0
7 x2 + 14 x = 0
x3 - 3 x2 + 1 = 0
x - 5 = 9 x + 7

What is the equation in point slope form of the line that passes through the point (-1, -3) and has a slope of 4? y-1=4(x-3) or y+3=4(x+1)

Convert 50 kilogram to pounds. (the conversion factor from kilogram to pound is 2.2046.) a. 52.2 lb. b. 110.2 lb. c. 22.6 lb. d. 47.8 lb.

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?