Question 490150
(a)
{{{  12 - (1/20)*x }}}
(b)
{{{ 12 - (1/20)*100 = 7 }}}
(c)
{{{ 5 = 12 - (1/20)*x }}}
{{{ 100 = 240 - x }}}
{{{ x = 240 - 100 }}}
{{{ x = 140 }}}
The car has gone 140 mi
(d)
{{{ 0 = 12 - (1/20)*x }}}
{{{ (1/20)*x = 12 }}}
{{{ x = 240 }}}
The car has gone 240 mi