diff --git a/csharp-fundamentals-control-flow.Main/Core.cs b/csharp-fundamentals-control-flow.Main/Core.cs
index 9fe1a9d..db61dad 100644
--- a/csharp-fundamentals-control-flow.Main/Core.cs
+++ b/csharp-fundamentals-control-flow.Main/Core.cs
@@ -48,61 +48,89 @@ public string sayGoodMorning(bool isMorning)
         // Change the returned value in the method below to your answer. It is case-sensitive.
         public string one()
         {
-            return "";
+            return "Good day!";
         }
 
         //TODO: 2. What will the output be if I run sayGoodMorning(true)?
         // Change the returned value in the method below to your answer. It is case-sensitive.
         public string two()
         {
-            return "";
+            return "Good morning!";
         }
 
         //TODO: 3. What will the output be if I run sayGoodMorning("Hello" == "Hello")?
         // Change the returned value in the method below to your answer. It is case-sensitive.
         public string three()
         {
-            return "";
+            return "Good morning!";
         }
 
         //TODO: 4. What will the output be if I run sayGoodMorning("A word" != "Another word")
         public string four()
         {
-            return "";
+            return "Good morning!";
         }
 
         // 5. What will the output be if I run sayGoodMorning(25 != 25)
         public string five()
         {
-            return "";
+            return "Good day!";
         }
 
         //TODO: 6. Use a conditional statement to return "Correct!" if the input is more than 7
         // or "Wrong!" if not
         public string six(int num)
         {
-            throw new NotImplementedException();
+            if (num > 7)
+            {
+                return "Correct!";
+            } 
+            else
+            {
+                return "Wrong!";
+            }
         }
 
         //TODO: 7. Use a conditional statement to return "Correct!" if the input is false
         // or "Wrong!" if not
         public string seven(bool boolean)
         {
-            throw new NotImplementedException();
+            if (boolean)
+            {
+                return "Wrong!";
+            }
+            else
+            {
+                return "Correct!";
+            }
         }
 
         //TODO: 8. Use a conditional statement to return "Correct!" if numOne is more than or equal to numTwo
         // or "Wrong!" if not
         public string eight(int numOne, int numTwo)
         {
-            throw new NotImplementedException();
+            if (numOne >= numTwo)
+            {
+                return "Correct!";
+            }
+            else
+            {
+                return "Wrong!";
+            }
         }
 
         //TODO: 9. Use a conditional statement to return true if the array provided is not empty
         // or false if it is empty
         public bool nine(int[] nums)
         {
-            throw new NotImplementedException();
+            if (nums.Length > 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
         }
 
         //TODO: 10. Use a conditional statement to return true if the provided string contains the word
@@ -110,7 +138,14 @@ public bool nine(int[] nums)
         // https://www.w3schools.com/java/java_ref_string.asp
         public bool ten(string sentence)
         {
-            throw new NotImplementedException();
+            if (sentence.Contains("milk"))
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
         }
 
         //TODO: 11. Use conditional statements to return the number 3 if the provided string contains
@@ -119,14 +154,36 @@ public bool ten(string sentence)
         // Otherwise, return the number 0.
         public int eleven(string sentence)
         {
-            throw new NotImplementedException();
+           if (sentence.Contains("milk") && sentence.Contains("coffee"))
+            {
+                return 9;
+            }
+            else if (sentence.Contains("coffee"))
+            {
+                return 6;
+            }
+            else if (sentence.Contains("milk"))
+            {
+                return 3;
+            }
+            else
+            {
+                return 0;
+            }
         }
 
         //TODO: 12. Use conditional statements to return true if num is more than or equal to lower and is
         // less than or equal to upper, otherwise return false.
         public bool twelve(int num, int lower, int upper)
         {
-            throw new NotImplementedException();
+            if (num >= lower && num <= upper)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
         }
 
         /*
@@ -141,7 +198,28 @@ public bool twelve(int num, int lower, int upper)
          */
         public string thirteen(int age)
         {
-            throw new NotImplementedException();
+            switch (age)
+            {
+                case < 1:
+                    return "Baby";
+                    break;
+
+                case < 5:
+                    return "Toddler";
+                    break;
+
+                case < 13:
+                    return "Child";
+                    break;
+
+                case < 20:
+                    return "Teenager";
+                    break;
+
+                default:
+                    return "Adult";
+                    break;
+            }
         }
     }
 }
diff --git a/csharp-fundamentals-control-flow.Main/Extension.cs b/csharp-fundamentals-control-flow.Main/Extension.cs
index 08108e2..606bd4f 100644
--- a/csharp-fundamentals-control-flow.Main/Extension.cs
+++ b/csharp-fundamentals-control-flow.Main/Extension.cs
@@ -20,7 +20,18 @@ public class Extension
         */
         public string timerStatus(int minutes)
         {
-            throw new NotImplementedException();
+            if (minutes == 0)
+            {
+                return "The cake is ready!";
+            }
+            else if (minutes > 0)
+            {
+                return "The cake is still baking!";
+            }
+            else 
+            {
+                return "The timer finished ages ago!";
+            }
         }
 
 
@@ -36,7 +47,14 @@ provided and the prep time per ingredient.
 
         public int estimatePrepTime(string[] ingredients, int time)
         { 
-            throw new NotImplementedException(); 
+            if (time == 0)
+            {
+                return ingredients.Length * 2;
+            }
+            else
+            {
+                return ingredients.Length * time;
+            }
         }
 
         //TODO: 3.  Create a method named calculateGramsOfSugar that accepts two parameters:
@@ -46,9 +64,16 @@ public int estimatePrepTime(string[] ingredients, int time)
             The method should return the number of grams of sugar needed to make the cake.
          */
 
-        public int calculateGramsOfSugar(string[] ingredients, int time)
+        public int calculateGramsOfSugar(string[] ingredients, int number)
         {
-            throw new NotImplementedException();
+            if (ingredients.Contains("sugar"))
+            {
+                return number * 100;
+            } 
+            else
+            {
+                return 0;
+            }
         }
     }
 }