1. Elliot drew this model to solve the problem but then realized he made a mistake. (a) What addition problem is represented by Elliot's model? (b) Draw a correct model for the addition problem .

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?

Select all of the quadrants that the parabola whose equation is y=√x-4 (principal square root) occupies. i ii iii iv

Which of the following is correct interpretation of the expression -4+13