If w is a positive integer, then 3^w + 3^(w +1) = Select:
A) 4^a	B) 3^a − 1	C) 3^(2a) + 1	D) 3^a*(a − 1)	E) 4(3^w)
3^w + 3^(w +1)   = 3^w + (3^w * 3^1)   = 3^w (1 + 3)   = 3^w(4)   Ans. 4(3^w)) 4(3^w)
<result>E</result>
If w is a positive integer, then 3^w + 3^(w +1) =