Question 776795
Let {{{ t }}} = talking time in minutes
{{{ .07t }}} = cost for talking {{{ t }}} minutes
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Let {{{ C }}}  = cost of the plan for July
{{{ C = 4.95 + .07t }}}
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Solving,
{{{ C = 29.45 }}}
{{{ 29.45 = 4.95 + .07t }}}
{{{ .07t = 29.45 - 4.95 }}}
{{{ .07t = 24.5 }}}
{{{ t = 350 }}}
350 minutes were used