Question 897109
The population approaches {{{ 11 }}}
As {{{ t }}} increases, {{{ .4^(1.8t ) }}}
approaches zero, so {{{ 520 * .4^(1.8t ) }}} 
approaches zero
Suppose {{{ t = 6 / 1.8 }}}
{{{ .4^( 1.8t ) = .4^6 }}}
{{{ .4^6 = .004096 }}}
{{{ 520*.004096 = 2.13 }}}
So, {{{ B(t) }}} is approaching {{{ 11 }}}
(D) is the answer