Question

400x= \frac{1}{20} [/tex]

Answer 1

$400x= \frac{1}{20} , x= \frac{1}{20*400}= \frac{1}{8000}$$4^x=128:2, 4^x=64, 4^x=4^3, x=3$$4^{6x}= \frac{1}{4}, 4^{6x}=4^{-1}, 6x=-1, x=- \frac{1}{6}$