- #1

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_{b}a + log

_{c}b + log

_{a}c = 1/log

_{a}b + 1/log

_{b}c + 1/log

_{c}a

2) log

_{r}p = q and log

_{q}r = p, show log

_{q}p = pq

3) if u = log

_{9}x, find in terms of u, log

_{x}81

4) log

_{5}x = 16log

_{x}5, solve for x

**attempt**

I know the change of base formula log

_{a}x = log

_{b}x/log

_{b}a, but I'm not sure if/how to apply it in any of the questions.

If there a trick I'm missing?