Question 643059
{{{ 15.5 = R^161 }}}
Take the log of both sides
{{{ log( 15.5 ) = 161*log( R ) }}}
{{{ 1.19033 = 161*log( R ) }}}
{{{ log( R ) = 1.19033 / 161 }}}
{{{ log( R ) = .0073934 }}}
{{{ R = 10^.0073934 }}}
{{{ R = 1.01717 }}}
check:
{{{ 15.5 = ( 1.01717 )^161 }}}
{{{ 15.5 = 15.50102 }}}
close enough