Suppose the video store charges non-members $4 to rent each video a store membership cost $21 and members may pay only $2.50 to run each video for what number of videos is the cost the same

Respuesta :

$4 for non-members
$21 fo menbership
$2.50 to run each video for what, so what you do is just add them up and you will get 
                                                                                                                               $2.75