1.	How many blocks are used in Stages 1–3?
		A.	9, 15, 21	B.	4, 7, 10
		C.	3, 6, 10	D.	3, 7, 10
		Hint
	2.	Find an expression for the number of blocks in Stage s.
		A.	s + 3	B.	3s
		C.	3s + 1	D.	2s – 1
		Hint
	3.	Draw a top-count view of this block
		A.		B.
		C.		D.
		Hint
	4.	Find an expression for the number of blocks in Stage s.
		A.	2s2	B.	s + 1
		C.	s2	D.	2s + 1
		Hint
	5.	Create a block pattern with s2 – 1 blocks.
		A.		B.
		C.		D.
		Hint