    ![[\because \log_aa=1]](/tpl/images/1368/2089/8cac9.png)
          ![[\because \log_a\dfrac{m}{n}=-\log_a\dfrac{n}{m}]](/tpl/images/1368/2089/90cb3.png)
        
     ![[\because a^{\log_ax}=x]](/tpl/images/1368/2089/d92a1.png)
Please help with 15, 17 and 19
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