Pre-Calculus Review Questions PLEASE HELP :(((?

Here are some questions I really need help on. Please answer as best you can, but you don't have to answer all of it. one or two is fine too. Thanks so much, I really appreciate it :)

1) Simplify (log (base7) 5)(log (base5) 2)

2) For what value of x is the following true?
log(x+6) = logx + log6

3) Simplify (tanx) / (secx-cosx)

4) Simplify ((sinx-cosx)^2) / (sinxcosx)

it's ok if you just give the answers. i could try and figure out the steps on my own.
thank you so much!! :))
 
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