How do you make an equation have zero solutions

What are the domain and range of the function? f(x) = -4 (sqrt)x

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expressions 4s +9s represents the total number of items that will be displayed on s shelves. simplify this expression

Iam at home. /: i am playing video games. translate the following statement into symbolic form.