1.	Factor r4 – 81.
		A.	prime	B.	(r + 3)2(r + 3)2
		C.	(r2 + 9)(r + 3)(r - 3)	D.	(r2 + 9)(r2 + 9)
		Hint
	2.	Factor 7xy2 - 28x3
		A.	7x(y + 2x)(y - 2x)	B.	7x2y2(1 + x)
		C.	prime	D.	(7xy + x)(y – 28x2)
		Hint
	3.	Solve 4y2 – 25 = 0.
		A.	or	B.
		C.		D.
		Hint
	4.	Solve 27x3 = 147x.
		A.		B.
		C.		D.
		Hint
	5.	Suppose that we have a 3 ft. × 3 ft. piece of paper, and we cut out a square piece so that the area of the remaining piece is 5 feet. What is the length of a side of the square?
		A.		B.
		C.	2 ft.	D.	4 ft.
		Hint