First, let's determine what (1/3) to the power of 4 is:
1/3 x 1/3 x 1/3 x 1/3 = 1/81
(1 x 1 x 1 x 1 = 1; 3 x 3 x 3 x 3 = 81)
1/81
Now what is 3 as a decimal?
We have to use the same denominator as 1/81 to be able to do a subtraction:
81 x 3 = 243
3 = 243/81
243/81 - 1/81 = 242/81
The answer is D.
Hope this helps! :) If you have any questions, let me know.