Which graph shows a dilation?

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

Simplify the given expression leaving the answer in improper fraction form. 2/3+5/6

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?