Question 1184035

answer is B.

{{{1.6*10^21=n^4   }}}

{{{1.6*10^21=(16/10)*10^21=16*10^20}}}

then

{{{n^4=16*10^20}}}

{{{n =(16*10^20)^(1/4)}}}

{{{n =16^(1/4)*(10^20)^(1/4)}}}

{{{n =2*(10^5)}}}

{{{n = 200000 }}}