r=3^(n+3), then in terms of r, 9^n= Options:
A) r^2/81
B) r^3/729
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 = 3^2 = 27   and you need the value of 9^n which is 9^0 = 1   So when you put r = 27 in the options, you should get 1. Only option (A) satisfies.   Answer (r^3/729)
<result>B</result>
r=3^(n+3), then in terms of r, 9^n=