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(5) Given,B(x)=-15x^(2)+390 x+115quad0 <= x <= 22". "Maximum or minimum occurs at the x where B^(')(x)=0.Now, quadB^(')(x)=0{:[=>-30 x+390=0],[=>-x+13=0],[=>x=13]:}and B^('')(x)=-30:.B^('')(13)=-30 < 0At x= ... See the full answer