r=3^(n+1), then in terms of r, 9^n=	Choose the correct choice from the following answers:  A) r^2/81  B) r^2/9  C) r^2  D) r/3  E) r
Questions in terms of variables can be easily solved by plugging in some values: Say n = 0   r = 3^1 = 3   and you need the value of 3^n which is 3^0 = 1   So when you put r = 3 in the options, you should get 1. Only option (A) satisfies.   Answer (r^2/9)
<result>B</result>
r=3^(n+1), then in terms of r, 9^n=