1.	Find a solution to the equation using backtracking.
		A.	s = 24	B.	s = 18
		C.	s = 21	D.	s = 15
		Hint
	2.	Find a solution to the equation using backtracking.
		A.	x = 9	B.	x = 8
		C.	x = 10	D.	x = 11
		Hint
	3.	Find a solution to the equation using guess-check-and-improve.
		A.	n = 6	B.	n = 2
		C.	n = 7	D.	n = 1
		Hint
	4.	Nine more than a number is the same as 18 less than 4 times the same number. Write an equation that models this statement.
		A.	y – 9 = 18 – 4y
		B.	y + 9 = 18 – 4y
		C.	y – 9 = 4y – 18
		D.	y + 9 = 4y – 18
		Hint
	5.	Nine more than a number is the same as 18 less than 4 times the same number. What is the number?
		A.	y = 9	B.	y = –8
		C.	y = –9	D.	y = 8
		Hint