diff --git a/__pycache__/exercise.cpython-36.pyc b/__pycache__/exercise.cpython-36.pyc
new file mode 100644
index 0000000..793f8ce
Binary files /dev/null and b/__pycache__/exercise.cpython-36.pyc differ
diff --git a/exercise.py b/exercise.py
index 0ae90ce..9747dfe 100644
--- a/exercise.py
+++ b/exercise.py
@@ -1,32 +1,70 @@
+"""
+Run:
+    python -m doctest -v exercise.py
+"""
+
 # problem 1
 # ------------------------------------------------------------------- #
 people = ['Bob Smith', 'Ken Jones', 'Alex Bradino']
 
 
 def sort_by_last_name(people, order):
-    # return full names sorted by last name in either ascending or descending order
-    # add doctests make sure it passes
-    pass
+    """
+    Sort by last names
+
+    Agruments: First Last names
+    Returns: sorted list of names by last name
+
+    Doctests:
+        >>> sort_by_last_name(['Bob Smith', 'Ken Jones', 'Alex Bradino'])
+        ['Alex Bradino', 'Ken Jones', 'Bob Smith']
+    """
+    return sorted(people, key=lambda person: person.split(' ')[-1], reverse = order)
 
 
 # problem 2
 # ------------------------------------------------------------------- #
+
 names = ['James', 'Susan', 'Maggie']
 ages = [4, 9, 12]
-
+d = {}
 
 def create_dictionary_from_lists(names, ages):
-    # {'James':4, 'Susan':9, 'Maggie':12}
-    # add doctests make sure it passes
-    pass
+    """
+    Create dictionary from lists
+
+    Agruments: names = list of names; ages = list of ages
+    Returns: Dictionary of name and age
+
+    Doctests:
+        >>> create_dictionary_from_lists(['James', 'Susan', 'Maggie'], [4,9,12])
+        {'James': 4, 'Susan': 9, 'Maggie': 12}
+    """
+    for k, v in zip(names, ages):
+        d[k] = v
+    return d
+
+    #{name:age for name, age in zip(names, ages)}
+
+
 
 
 # problem 3
 # ------------------------------------------------------------------- #
+
 numbers = [5, 6, 7, 8, 9, 10, 11, 12]
 
 
 def square_even_values_and_sum_under_10(numbers):
-    # 6^2 + 8^2]
-    # add doctests make sure it passes
-    pass
+    """
+        Squares even values under 10
+
+        Agruments: numbers
+        Returns: sum of even squares
+
+        Doctests:
+        >>> square_even_values_and_sum_under_10([5, 6, 7, 8, 9, 10, 11, 12])
+        344
+    """
+    evens = list(filter(lambda n: n % 2 == 0 , numbers))
+    return sum(list(map(lambda n: n**2, evens)))