diff --git a/assignment_1.py b/assignment_1.py
index ad78373..90bdc14 100644
--- a/assignment_1.py
+++ b/assignment_1.py
@@ -15,8 +15,9 @@ def lower_case(string):
 
     """
 
-    ### your code starts here
 
+    ### your code starts here
+    lower_string = string.lower()
     ### your code ends here
 
     return lower_string
@@ -38,6 +39,7 @@ def upper_case(string):
     """
 
     ### your code starts here
+    upper_string = string.upper() 
 
     ### your code ends here
 
diff --git a/assignment_2a.py b/assignment_2a.py
index 1b8fc0e..a370b26 100644
--- a/assignment_2a.py
+++ b/assignment_2a.py
@@ -10,9 +10,9 @@
 just give a correct one.
 """
 
-var_1 = function_2c(...)
+var_1 = function_2c(1000,100,100,-50)["add"]
 
-var_2 = function_2b(...)
+var_2 = function_2b("Seminars","Borrel")["C"]
 
 if var_1 == 950:
     print("Good job!")
diff --git a/assignment_2b.py b/assignment_2b.py
index 1aef416..1453142 100644
--- a/assignment_2b.py
+++ b/assignment_2b.py
@@ -5,6 +5,25 @@
 No cheating! Don't show or tell hem the code directly
 """
 def function_2b(string_1, string_2):
+    """
+    Takes two strings and returns a dictionary of 3 strings. string_1 in lowercase. String_2 in uppercase.
+    A third string which is the concatenation of the operations on string_1 and string_2.
+
+
+    Parameters
+    ----------
+    string_1: str
+        a string to convert to all lowercase
+    string_2: str
+        a string to convert to all uppercase
+
+    Returns
+    ----------
+    dict : dict
+        a dictionary with keys: "L","U","C"
+        contains string_1 in lowercase, string_2 in uppercase and the concatenation of string_1 and string_2 respectively
+
+    """
 
     lower = string_1.lower()
     upper = string_2.upper()
@@ -15,3 +34,4 @@ def function_2b(string_1, string_2):
                "C": combined}
 
     return dict
+    
\ No newline at end of file
diff --git a/assignment_2c.py b/assignment_2c.py
index 1ac1ced..0d32570 100644
--- a/assignment_2c.py
+++ b/assignment_2c.py
@@ -5,6 +5,28 @@
 No cheating! Don't show or tell hem the code directly
 """
 def function_2c(w, x, y, z):
+    """
+    Takes 4 integers w,x,y and z. Returns a dictionary containing multiplication, division, addition
+     and subtraction on these integers.
+
+
+    Parameters
+    ----------
+    w : int
+        integer
+    x : int
+        integer
+    y : int 
+        integer
+    z : integer
+
+    Returns
+    ----------
+    results : dict
+        a dictionary with keys: "multiply","divide","add", "subtraction"
+        contains multiplication of x,y; division of x,y; addition of w,z; subtraction of w,z respectively.
+
+    """
 
     multiplication = x * y
     division = x / y