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# The revenue r received by a video store renting x dvds per day is given by the function upper r left parenthesis x right parenthesis equals negative 0.1 x squared plus 50 xr(x)=−0.1x2+50x. (a) ho

The revenue r received by a video store renting x dvds per day is given by the function upper r left parenthesis x right parenthesis equals negative 0.1 x squared plus 50 xr(x)=−0.1x2+50x. (a) how many dvds must be rented in order for revenue to be $ 4000$4000 per day? (b) how many dvds must be rented in order for revenue to be $ 6250$6250 per day?