Question 660347
{{{ 1.2*log(w) - log( 3w + 7 ) = 1 }}} ( is this it )?
{{{ log( w^1.2 ) - log( 3w + 7 ) = log(10) }}}
{{{ log( w^1.2 ) = log( 10 ) + log( 3w + 7 ) }}}
{{{ log( w^1.2 ) = log( 10*( 3w + 7 ) ) }}}
{{{ log( w^1.2 ) = log( 30w + 70 ) }}}
{{{ w^1.2 = 30w + 70 }}}
{{{ w^1.2 - 30w - 70 = 0 }}}
Now I'm stuck
{{{ 2.12 + 20^( 7 - 2t ) = 50 }}}
{{{ 20^( 7 - 2t ) = 47.88 }}}
{{{ log( 20^( 7 - 2t )) = log( 47.88 ) }}}
{{{ ( 7 - 2t )* log( 20 ) = log( 47.88 ) }}}
{{{ 7 - 2t = log( 47.88 ) / log( 20 ) }}}
{{{ 2t = 7 - log( 47.88 ) / log( 20 ) }}}
{{{ t = 7/2 - log( 47.88 ) / (2*log( 20 )) }}}
I'm not sure I copied these right