diff --git a/exercises/02-Hello-World/app.py b/exercises/02-Hello-World/app.py
index 801de24..a7b3217 100644
--- a/exercises/02-Hello-World/app.py
+++ b/exercises/02-Hello-World/app.py
@@ -1 +1,2 @@
-# your code here
\ No newline at end of file
+# your code here
+print("Hello World")
\ No newline at end of file
diff --git a/exercises/03-What-is-a-function/app.py b/exercises/03-What-is-a-function/app.py
index 551610b..39daa3a 100755
--- a/exercises/03-What-is-a-function/app.py
+++ b/exercises/03-What-is-a-function/app.py
@@ -5,7 +5,8 @@ def sum(number1,number2):
 print(total)
 
 
-
+super_duper = sum(3445324,53454423)
+print(super_duper)
 
 
 
diff --git a/exercises/04-Call-a-function/app.py b/exercises/04-Call-a-function/app.py
index c856d48..935d79a 100755
--- a/exercises/04-Call-a-function/app.py
+++ b/exercises/04-Call-a-function/app.py
@@ -1,4 +1,14 @@
 def calculate_area(length,edge):
 	return length * edge
 
-# Your code Below this line:
\ No newline at end of file
+# Your code Below this line:
+square_area1 = calculate_area(4,4)
+print (square_area1)
+
+square_area2 = calculate_area(2,2)
+print(square_area2) 
+
+square_area3 = calculate_area(5,5)
+print(square_area3) 
+
+
diff --git a/exercises/05-Defining-vs-Calling-a-function/app.py b/exercises/05-Defining-vs-Calling-a-function/app.py
index 79b86d8..7b562c9 100755
--- a/exercises/05-Defining-vs-Calling-a-function/app.py
+++ b/exercises/05-Defining-vs-Calling-a-function/app.py
@@ -1,5 +1,6 @@
 # Define the function called "multi" that expects 2 parameters:
-
+def multi(a,b):
+    return a*b
 # don't edit anything below this line
 return_value = multi(7,53812212)
 print(return_value)
\ No newline at end of file
diff --git a/exercises/06-lambda-functions/app.py b/exercises/06-lambda-functions/app.py
index e59626e..1c3f267 100755
--- a/exercises/06-lambda-functions/app.py
+++ b/exercises/06-lambda-functions/app.py
@@ -1,2 +1,9 @@
 # your function here
 
+# this function return True if a number is odd.
+# def is_odd(num):
+#     return (num % 2)! == 0:
+
+is_odd = lambda num: (num % 2)!= 0
+
+print(is_odd)
\ No newline at end of file
diff --git a/exercises/07-lambda-function-two/app.py b/exercises/07-lambda-function-two/app.py
index fca265d..9cc2405 100755
--- a/exercises/07-lambda-function-two/app.py
+++ b/exercises/07-lambda-function-two/app.py
@@ -1,4 +1,4 @@
-
+rapid = lambda string: string[:-1]
 
 
 # From this line above, plese do not change code below
diff --git a/exercises/08-Function-that-returns/app.py b/exercises/08-Function-that-returns/app.py
index 44ab611..6522599 100755
--- a/exercises/08-Function-that-returns/app.py
+++ b/exercises/08-Function-that-returns/app.py
@@ -4,4 +4,8 @@ def dollar_to_euro(dollar_value):
 def euro_to_yen(euro_value):
 	return euro_value * 124.15
 
-####### ↓ YOUR CODE BELOW ↓ #######
\ No newline at end of file
+####### ↓ YOUR CODE BELOW ↓ #######
+dollar1euro = dollar_to_euro(137)
+
+euro1yen = euro_to_yen(dollar1euro)
+print(str(euro1yen))
\ No newline at end of file
diff --git a/exercises/09-Function-parameters/app.py b/exercises/09-Function-parameters/app.py
index 71294e0..b0d293d 100755
--- a/exercises/09-Function-parameters/app.py
+++ b/exercises/09-Function-parameters/app.py
@@ -1,6 +1,8 @@
 # Your code goes here:
-def render_person(param):
-    return param
+def render_person(name,date,color,age,gender):
+    concat = name +" "+ "is a"+" "+str(age)+" "+ "years old" +" "+ gender+" "+"born in"+" "+date +" "+ "with" +" "+ color +" "+ "eyes"
+    return concat
+
 
 
 # Do not edit below this line
diff --git a/exercises/10-Array-Methods/app.py b/exercises/10-Array-Methods/app.py
index fdddc23..039e702 100755
--- a/exercises/10-Array-Methods/app.py
+++ b/exercises/10-Array-Methods/app.py
@@ -1,5 +1,7 @@
 names = ['John', 'Kenny', 'Tom', 'Bob', 'Dilan']
 ## CREATE YOUR FUNCTION HERE
 
+def sort_names(order):
+    return sorted(order)
 
 print(sort_names(names))