1.	Simplify (4r - s) - (r + 2s) + (3r - s).
		A.	6r - 4s	B.	8r
		C.	3r - 2s	D.	6r - 3s
		Hint
	2.	Find (4x2 + 3x) + (7x2 – 5x – 6).
		A.	11x2 – 2x – 6	B.	11x4 – 2x2 – 6
		C.	9x – 6	D.	11x2 – 8x – 6
		Hint
	3.	Find the difference (-3x3 – 7x2 + 5x – 4) – (6x2 – 8).
		A.	–3x3 – 13x2 + 5x - 12	B.	-11x8 + 4
		C.	–3x3 – x2 + 5x - 12	D.	–3x3 – 13x2 + 5x + 4
		Hint
	4.	Find the sum (4xy2 – 3x2y – 5xy – 6) + (-5xy2 – 2xy + 3).
		A.	-xy2 – 3x2y – 7xy – 3	B.	4xy2 – 7xy – 3
		C.	4xy2 – 8x2y – 7xy – 3	D.	-xy2 – 3x2y – 3xy – 3
		Hint
	5.	Determine whether the expression 5x3y3 – x2y2 is a polynomial.
		A.	No, because there are two terms.	B.	Cannot be determined from given information.
		C.	No, because there are two variables.	D.	Yes.
		Hint