Just wanted to put this out to help anyone, and if anyone sees anything incorrect or if they believe they have a better answer. Go ahead and point out any errors or helpers if you want.

1. a) Return type does not equal to return value
b) This one im not so sure i think you don't need the params in front of int[] args, or that the parmeters don't match

2. a) seems theres 2, twos

I had entered a string named: "String" and a int: 10 into my command line arguements

        static void Main(string[] args)
        {
            string myString = args[0];
            int myInt = Convert.ToInt32(args[1]);
            Console.WriteLine("{0} command line arguments were specified:", args.Length);
            Console.WriteLine("The string command line was: {0}\nThe int command line was: {1}",
                myString, myInt);
        }

2. b)

    class Class1
    {
        delegate string impersonateDelegate();

        static string input()
        {
            return Console.ReadLine();
        }
        static void Main(string[] args)
        {
            Console.WriteLine("Please enter a string:");
            impersonateDelegate impersonate = new impersonateDelegate(input);
            string myString = impersonate();
            Console.WriteLine("Your string was {0}", myString);
        }
    }

3 and 4)

Seemed like these where similiar problems so I just joined them into one app. You don't really need the info in main since it just asked for a function in the struct on 4. But I just wanted to be able to interact with it and see it work.

    class Class1
    {
        struct order
        {
            public string itemName;
            public int unitCount;
            public double unitCost;

            public double Total()
            {
                return unitCount * unitCost;
            }
            public string TotalCost()
            {
                return "Order information: " + unitCount + " " + itemName + " items at $" + unitCost
                    + " each, total cost $" + Total();
            }
        }
        static void Main(string[] args)
        {
            order orderTotal;
            orderTotal.itemName = "CD";
            orderTotal.unitCost = 15;
            Console.WriteLine("How many {0}'s do you want:", orderTotal.itemName);
            orderTotal.unitCount = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine(orderTotal.TotalCost());
        }
    }

I think the problem with the second function in exercise 1 is that the params type cannot be used as a parameter unless it is the last one in the function. For instance, the function's definition SHOULD be:

static void myFunction(string label, bool showLabel, params int[] args)
{
   ...
}

1 b) also whats the defualt for showLabel? nothing? true? or false?
params should be the last item of the declaration as well

Here is my take on 2b./3. it just eliminates the redundant assignment of the string.

class Class1
{
    delegate string procDel();

    static string Readit()
    {
    return Console.ReadLine();
    }
.
.
.
static void Main(string[] args)
    {
    Console.Write("Please enter any string of characters: ");

    procDel myString = new procDel(Readit);

    Console.WriteLine("\nString entered was {0}\n", myString());
    }
}