We want (a) log 5/6. There's a rule of logs that states that
log a/b = log a - log b. Here, log 5/6 = log 5 - log 6 = 0.699 - [log 2 + log 6].
This, in turn, is 0.699 - [0.301 + 0.477] = 0.699 - 0.778 = -0.079 = log 5/6.
Check: does 10^(-0.079) = 0.834 = 5/6? Yes, approximately. 5/6 = 0.33333...
Also find (b) log 0.3. log 0.3 = log 3/10 = log 3 - log 10 = log 3 - 1.
log 3 - 1 = 0.477 - 1.000 = -0.523.
Check: Does 10^(-0.523) = 0.3? YES
