Define a procedure fourthPower(x) that takes a numeric parameter x and returns that value raised to the fourth power. It should have type num -> num. You should use the square procedure (you don’t need to redefine it in this box; it will use our definition when your code is run by the tutor).

def square(x):
    return x * x

def fourthPower(x):
    return square(x) * square(x)