Answer:
-4/3.
Step-by-step explanation:
Using the change of base formula convert to log 3:
logb x = loga x / loga b
log(1/27) 81 = log3 81 / log3 1/27
log3 81 = 4 ( because 3^4 = 81) and log3 1/27 = -3 (because 3^-3 = 1/27)
So log(1/27) 81 = 4/-3 = -4/3.
