diff --git a/calculator.py b/calculator.py
index a46affd..f794caa 100644
--- a/calculator.py
+++ b/calculator.py
@@ -1,3 +1,5 @@
+import traceback
+
 """
 For your homework this week, you'll be creating a wsgi application of
 your own.
@@ -42,16 +44,49 @@
 """
 
 
+def home():
+
+    body = """
+    <h2>Calculator Home</h2>
+    <h3>To use this calculator, input the operator and two "/" separated values in the url path:
+    <ul><li>http://localhost:8080/multiply/3/5   => 15</li>
+    <li>http://localhost:8080/add/23/42      => 65</li>
+    <li>http://localhost:8080/subtract/23/42 => -19</li>
+    <li>http://localhost:8080/divide/22/11   => 2</li></ul>"""
+
+    return body
+
+
 def add(*args):
     """ Returns a STRING with the sum of the arguments """
 
-    # TODO: Fill sum with the correct value, based on the
-    # args provided.
-    sum = "0"
+    body = '<h2>Sum of {} and {}: {}</h2>'.format(*args, sum(args))
+    return body
+
+
+def subtract(*args):
+    """ Returns a STRING with the difference of the arguments """
+
+    body = '<h2> Difference of {} and {}: {}</h2>'.format(*args, args[0]-args[1])
+    return body
 
-    return sum
 
-# TODO: Add functions for handling more arithmetic operations.
+def multiply(*args):
+    """ Returns a STRING with the product of the arguments """
+
+    body = '<h2> Product of {} and {}: {}</h2>'.format(*args, args[0]*args[1])
+    return body
+
+
+def divide(*args):
+    """ Returns a STRING with the quotient of the arguments """
+
+    try:
+        body = '<h2> Quotient of {} and {}: {}</h2>'.format(*args, args[0]/args[1])
+    except ZeroDivisionError:
+        body = '<h2> Cannot divide by zero!</h2>'
+    return body
+
 
 def resolve_path(path):
     """
@@ -59,26 +94,53 @@ def resolve_path(path):
     arguments.
     """
 
-    # TODO: Provide correct values for func and args. The
-    # examples provide the correct *syntax*, but you should
-    # determine the actual values of func and args using the
-    # path.
-    func = add
-    args = ['25', '32']
+    funcs = {
+        '': home,
+        'add': add,
+        'subtract': subtract,
+        'multiply': multiply,
+        'divide': divide,
+    }
+    path = path.strip('/').split('/')
+    func_name = path[0]
+    args = path[1:]
+    args = [int(i) for i in args]
+
+    try:
+        func = funcs[func_name]
+    except KeyError:
+        raise NameError
 
     return func, args
 
+
 def application(environ, start_response):
-    # TODO: Your application code from the book database
-    # work here as well! Remember that your application must
-    # invoke start_response(status, headers) and also return
-    # the body of the response in BYTE encoding.
-    #
-    # TODO (bonus): Add error handling for a user attempting
-    # to divide by zero.
-    pass
+    headers = [('Content-type', 'text/html')]
+    try:
+        path = environ.get('PATH_INFO', None)
+        print('path: {}'.format(path))
+        if path is None:
+            raise NameError
+        func, args = resolve_path(path)
+        body = ['<h1>WSGI Calculator</h1>']
+        body.append(func(*args))
+        body = '\n'.join(body)
+        status = "200 OK"
+    except NameError:
+        status = '404 Not Found'
+        body = '<h1>Not Found</h1>'
+    except Exception:
+        status = '500 Internal Server Error'
+        body = '<h1>Internal Server Error</h1>'
+        print(traceback.format_exc())
+    finally:
+        headers.append(('Content-length', str(len(body))))
+        start_response(status, headers)
+        print(body)
+        return [body.encode('utf8')]
+
 
 if __name__ == '__main__':
-    # TODO: Insert the same boilerplate wsgiref simple
-    # server creation that you used in the book database.
-    pass
+    from wsgiref.simple_server import make_server
+    srv = make_server('localhost', 8080, application)
+    srv.serve_forever()