Need Help With a Logarithmic Problem

I dont understand what I am doing wrong.

Here it is

Given log a ^2= .69, log a ^3=1.10 and log a ^5=1.61, use the properties of logarithms to evaluate:

log a 1/square root of 15

Can any of you please help with this problem? I would really appreciate it.

Re: Need Help With a Logarithmic Problem

The question is not clear. What do you want to find

log a 1/square root of 15???? or log a^1/square root of 15??

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Re: Need Help With a Logarithmic Problem

Attachment 26452

Here is a picture of the problem. Thank you.

Re: Need Help With a Logarithmic Problem