1950 AMC 12 Question 18

Of the following

$(1)\quad a(x-y)=ax-ay$

$(2)\quad a^{x-y}=a^x-a^y$

$(3)\quad \log(x-y)=\log x-\log y$

$(4)\quad \dfrac{\log x}{\log y}=\log x-\log y$

$(5)\quad a(xy)=ax\times ay$