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Which of the following are correct? a.(...

Which of the following are correct?
a.`(log)_3 19.(log)_(1//7)3.(log)_4 1/7>2`
b. `(log)_5(1//23)` lies between `-2 &-1`
c.`\ ` If `m=4^((log)_4 7)a n d\ n=(1/9)^(-(log)_3 7)t h e n\ n=m^4`
d. `(log)_(sqrt(5))sin(pi/5)dot(log)_(sqrt(sin(pi/5)))5` simplifies to an irrational number

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