Question 1140
 If v=log(base 2)(1/4), by definition of log,
 2^v = 4.
 Now if v= -2, 2^(-2) = 1/2^2 = 1/4
 So your answer is correct.

 One way to solve:
 v = log(base 2)(1/4) = -log(base 2)4 =  -log(base 2) 2^2
 =  - 2 log(base 2) 2 = -2 * 1 = -2.