Chapter 7 - Functions - Exercise Set 7.1 - Page 394: 17

$a-\log_{2}8=3\\ because\,\,2^3=8\\ b-\log_{5}\frac{1}{25}=-2\\ because\,\,5^{-2}=\frac{1}{25}\\ c-\log_{4}4=1\\ because\,\,4^1=4\\ d-\log_{3}3^n=n\\ because\,\,3^n=3^n\\ e-\log_{4}1=0\\ because\,\,4^0=1\\ $

$a-\log_{2}8=3\\ because\,\,2^3=8\\ b-\log_{5}\frac{1}{25}=-2\\ because\,\,5^{-2}=\frac{1}{25}\\ c-\log_{4}4=1\\ because\,\,4^1=4\\ d-\log_{3}3^n=n\\ because\,\,3^n=3^n\\ e-\log_{4}1=0\\ because\,\,4^0=1\\ $