Cuantos números de 8 cifras diferentes se pueden formar con los dígitos 1,2,3,4,5

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

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2