1.	Solve .
		A.	10	B.	5
		C.		D.	3
		Hint
	2.	Solve .
		A.	-7 or 2	B.	7
		C.	7 or 2	D.	-7
		Hint
	3.	Solve .
		A.	-2	B.	-2 or
		C.	5	D.	-2 or 7
		Hint
	4.	Juan and Sam have to complete 4 home repair jobs this week. If Juan works by himself, he can do the repairs in 7 days. With Sam helping him, they completed them in 3 days. How long would it take Sam to complete the repairs alone?
		A.		B.
		C.		D.
		Hint
	5.	Solve .
		A.	0 only	B.	–9 only
		C.	9 only	D.	{0, 9}
		Hint