Please help asap

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

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5