Pls help! i cannot figure this out and in totally confused!

What are the possible rational zeros of [tex]f(x) = x^4+2x^3-3x^2-4x+18[/tex]

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

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days