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