I can’t find the difference

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

Drag each tile to the correct box. not all tiles will be used. consider the recursively defined function below. create the first five terms of the sequence defined by the given function

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !