r=4^(n+2), then in terms of r, 9^n= Choose the most appropriate option.
A) r^2/81 B) r^2/9 C) r^2/256 D) r/3 E) r
Questions in terms of variables can be easily solved by plugging in some values: Say n = 0   r = 4^2 = 16   and you need the value of 16^n which is 16^0 = 1   So when you put r = 16 in the options, you should get 1. Only option (A) satisfies.   Answer (r^2/256)
<result>C</result>
r=4^(n+2), then in terms of r, 9^n=