def add_two(a, b):
    """Return the sum of two numbers.

    Parameters
    ----------
    a : int or float
        The first number.
    b : int or float
        The second number.

    Returns
    -------
    int or float
        The sum of the two numbers.
    """   
    pass # Replace this line with the correct expression

def multiply_two(a, b):
    """Return the product of two numbers.

    Parameters
    ----------
    a : int or float
        The first number.
    b : int or float
        The second number.

    Returns
    -------
    int or float
        The product of the two numbers.
    """
    pass # Replace this line with the correct expression