Which of the following relations is also a function?

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

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

Factor 15x^3 - 5x^2 +6x-2 by grouping. what is the resulting expression