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

$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

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*

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