1.	Find a solution to the equation using backtracking.
		A.	s = 21	B.	s = 24
		C.	s = 15	D.	s = 18
		Hint
	2.	Find a solution to the equation using backtracking.
		A.	x = 9	B.	x = 10
		C.	x = 8	D.	x = 11
		Hint
	3.	Find a solution to the equation using guess-check-and-improve. 10a + 4(a + 1) = 32
		A.	a = 2	B.	a = 4
		C.	a = 7	D.	a = 10
		Hint
	4.	Find a solution to the equation using guess-check-and-improve.
		A.	n = 6	B.	n = 1
		C.	n = 7	D.	n = 2
		Hint
	5.	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 = 4y – 18
		B.	y – 9 = 18 – 4y
		C.	y + 9 = 4y – 18
		D.	y + 9 = 18 – 4y
		Hint