Question

ME AJUDEM A RESPONDER ESSAS QUESTÕES! 20 PONTOS

Answer 1

4)

$log_{9}(20) = \frac{ log(20) }{ log(9) } = \frac{ log(2.10) }{ log( {3}^{2} ) } \\ = \frac{ log(2) + log(10) }{2 log(3) }$

$\frac{0,3 + 1}{2. 0,4} = \frac{1,3}{0,8} =1,625$

5)

$log(x + 80)+ log(3) = log(60) \\ log \: 3(x + 80) = log(60) \\ 3(x + 80) = 60 \\ x + 80 = \frac{60}{3}$

$x + 80 = 20 \\ x = 20 - 80 \\ x = - 60$

6)

$log_{7}(2401) = log_{7}( {7}^{4} ) = 4 log_{7}(7) \\ = 4$