how to pass values with static void?

using System;

class Program
{

    // YOUR CODE HERE: Define a method named Multiply. Remember
    // to use the "static" and "void" keywords: "static void
    // Multiply" (without quotes). Multiply should take two
    // "double" values as parameters.

    static double Multiply( double  first, double second )
    {
        return first * second;

    }

    static void Main(string[] args)
    {

        Console.WriteLine(Multiply(2.5,2));
        Console.WriteLine(Multiply(6,7));





        // YOUR CODE HERE:
        // Call Multiply with two arguments: 2.5 and 2.
        // YOUR CODE HERE:
        // Call Multiply with two arguments: 6 and 7.
    }

}