1.	Which problem-solving strategy is used in indirect proofs?
		A.	decision-making	B.	draw a diagram
		C.	working backward	D.	guess and check
		Hint
	2.	Which assumption would you make to start an indirect proof of the statement Bob took the dog for a walk
		A.	Bob will take the dog for a walk.
		B.	Bob does not have to take the dog for a walk.
		C.	Bob may take the dog for a walk.
		D.	Bob did not take the dog for a walk.
		Hint
	3.	State the assumption that could be used to start an indirect proof of the statement Points A, B, C, and O are coplanar.
		A.	Points A, B, C, and O are not coplanar.	B.	Points A, B, C, and O are coplanar.
		C.	Points A, B, C, and O form a quadrilateral.	D.	Points A, B, C, and O are collinear.
		Hint
	4.	State the assumption that could be used to start an indirect proof of the statement m1 + m2 = 180.
		A.	m1 + m2 = 90	B.	m1 and m2 are complementary.
		C.	m1 and m2 are supplementary.	D.	m1 + m2 180
		Hint
	5.	Which assumption would you make to start an indirect proof of the following statement? The majority of students surveyed preferred chocolate ice cream to vanilla ice cream.
		A.	The number of students surveyed that preferred chocolate ice cream to vanilla ice cream was greater than 50%.
		B.	The number of students surveyed that preferred vanilla ice cream to chocolate ice cream was greater than 25%.
		C.	The number of students surveyed that preferred chocolate ice cream to vanilla ice cream was greater than 25%.
		D.	The number of students surveyed that preferred vanilla ice cream to chocolate ice cream was greater than 50%.
		Hint