diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..a6b8c64d8 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1 @@
-console.log("Hello world");
+console.log("Hello World. I just started learning JavaScript!");
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..a01120326 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,5 @@
-// Start by creating a variable `greeting`
+var greeting = "Hello world";
 
 console.log(greeting);
+console.log(greeting);
+console.log(greeting);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..344e5c1db 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,5 @@
-// Start by creating a variable `message`
+var message = "This is a string";
+var messageType = typeof message;
 
 console.log(message);
+console.log(messageType);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..81dbad022 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,5 @@
-// Start by creating a variable `message`
+var greetingStart  = "Hello, my name is ";
+var name = "Daniel";
+var greeting = greetingStart + name;
 
-console.log(message);
+console.log(greeting);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..230a51316 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,5 @@
-// Start by creating a variable `message`
+var name = "Daniel";
+var nameLength = name.length;
+var message = "My name is " + name + " and my name is " + nameLength + " characters long";
 
 console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..3d5d36726 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,5 @@
-const name = " Daniel  ";
+const name = "Daniel ".trim();
+var nameLength = name.length;
+var message = "My name is " + name + " and my name is " + nameLength + " characters long";
 
 console.log(message);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..b5c302e5f 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,8 @@
-// Start by creating a variables `numberOfStudents` and `numberOfMentors`
+var numberOfStudents = 15;
+var numberOfMentors = 8;
+
+var total = numberOfStudents + numberOfMentors;
+
+console.log("Number of students: " + numberOfStudents)
+console.log("Number of mentors: " + numberOfMentors)
+console.log("Total numnber of students and mentors: " + total);
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..078ed7540 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,12 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+
+var total = numberOfStudents + numberOfMentors;
+
+var percent = 100 / total;
+
+var numberOfStudentsPercent =  Math.round(percent * numberOfStudents);
+var numberOfMentorsPercent =  Math.round(percent * numberOfMentors);
+
+console.log("Number of students: " + numberOfStudentsPercent + "%")
+console.log("Number of mentors: " + numberOfMentorsPercent + "%")
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..648befa3e 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,5 +1,6 @@
-function halve(number) {
-  // complete the function here
+function halve(number)
+{
+    return number / 2;
 }
 
 var result = halve(12);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..1cba5ed23 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,6 @@
-function triple(number) {
-  // complete function here
+function triple(number)
+{
+    return number * 3;
 }
 
 var result = triple(12);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..bdc3caa1c 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,9 +1,8 @@
-// Complete the function so that it takes input parameters
-function multiply() {
-  // Calculate the result of the function and return it
+function multiply(number1, number2)
+{
+    return number1 * number2;
 }
 
-// Assign the result of calling the function the variable `result`
 var result = multiply(3, 4);
 
 console.log(result);
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..211539f4e 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,4 +1,7 @@
-// Declare your function first
+function divide(number1, number2)
+{
+    return number1 / number2;
+}
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..feaca034c 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,7 @@
-// Write your function here
-
+function createGreeting(name)
+{
+    return "Hello, my name is " + name;
+}
 var greeting = createGreeting("Daniel");
 
 console.log(greeting);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..6ad905e33 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,7 @@
-// Declare your function first
-
-// Call the function and assign to a variable `sum`
+function add(num1, num2)
+{
+    return num1 + num2;
+}
+var sum = add(13, 124);
 
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..caae16df3 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,4 +1,7 @@
-// Declare your function here
+function createLongGreeting(name, num)
+{
+    return "Hello, my name is " + name + " and I'm " + num + " years old";
+}
 
 const greeting = createLongGreeting("Daniel", 30);
 
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..b2d5fccff 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -3,3 +3,20 @@ var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function createGreeting(mentor)
+{
+    return ("hello " + mentor).toUpperCase();
+}
+
+const greeting1 = createGreeting(mentor1);
+const greeting2 = createGreeting(mentor2);
+const greeting3 = createGreeting(mentor3);
+const greeting4 = createGreeting(mentor4);
+const greeting5 = createGreeting(mentor5);
+
+console.log(greeting1);
+console.log(greeting2);
+console.log(greeting3);
+console.log(greeting4);
+console.log(greeting5);
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 75b3c6aab..8f51138c0 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,7 +5,10 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(amount)
+{
+    return amount * 1.4;
+}
 
 /*
   CURRENCY CONVERSION
@@ -15,7 +18,10 @@ function convertToUSD() {}
   They have also decided that they should add a 1% fee to all foreign transactions, which means you only convert 99% of the £ to BRL.
 */
 
-function convertToBRL() {}
+function convertToBRL(amount)
+{
+    return parseFloat(((amount * 0.99) * 5.7).toFixed(2));
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/2-piping.js b/extra/2-piping.js
index b4f8c4c1b..39b7f5f88 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -5,7 +5,6 @@
   - one that adds 2 numbers together
   - one that multiplies 2 numbers together
   - one that formats a number so it's returned as a string with a £ sign before it (e.g. 20 -> £20)
-
   2. Using the variable startingValue as input, perform the following operations using your functions all
   on one line (assign the result to the variable badCode):
   - add 10 to startingValue
@@ -16,26 +15,38 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(num1, num2)
+{
+    return num1 + num2;
 }
 
-function multiply() {
-
+function multiply(num1, num2)
+{
+    return num1 * num2;
 }
 
-function format() {
-
+function format(num1)
+{
+    return "£" + num1.toString();
 }
 
 const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+//This code is bad because it leaves a mess behind without cleaning up the code. It also does too many calcualations which cant ebe done in one claculation.
+let badCode = 0;
+//let badCode = 0 + startingValue;
+badCode = startingValue + badCode;;//this should work, i dont know
+badCode = badCode * startingValue;//does this equal 4?
+badCode = startingValue * 12;//this should be enough
+badCode = "£" + badCode;
+console.log(badCode);//this might work
 
-/* BETTER PRACTICE */
 
-let goodCode =
+/* BETTER PRACTICE */
+let goodCode = 0;
+goodCode = "£" + ((goodCode + startingValue) * 12);
+console.log(goodCode);
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/3-magic-8-ball.js b/extra/3-magic-8-ball.js
index 46f65f928..62cc6a899 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -45,8 +45,31 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
-function shakeBall() {
-  //Write your code in here
+function shakeBall()
+{
+  const answer = [
+    "It is certain.",
+    "It is decidedly so.",
+    "Without a doubt.",
+    "Yes - definitely.",
+    "You may rely on it.",
+    "As I see it, yes.",
+    "Most likely.",
+    "Outlook good.",
+    "Yes.",
+    "Signs point to yes.",
+    "Reply hazy, try again.",
+    "Ask again later.",
+    "Better not tell you now.",
+    "Cannot predict now.",
+    "Concentrate and ask again.",
+    "Don't count on it.",
+    "My reply is no.",
+    "My sources say no.",
+    "Outlook not so good.",
+    "Very doubtful."];
+  console.log("The ball has shaken!");
+  return answer[Math.floor(Math.random() * answer.length)];
 }
 
 /* 
@@ -58,8 +81,27 @@ function shakeBall() {
 
   This function should expect to be called with any value which was returned by the shakeBall function.
 */
-function checkAnswer(answer) {
-  //Write your code in here
+function checkAnswer(answer)
+{
+  if (answer === ("It is certain.") || answer === ("It is decidedly so.") || answer === ("Without a doubt.") || answer === ("Yes - definitely.") || answer === ("You may rely on it."))
+  {
+    return "very positive"
+  }
+  
+  else if (answer === ("As I see it, yes.") || answer === ("Most likely.") || answer === ("Outlook good.") || answer === ("Yes.") || answer === ("Signs point to yes."))
+  {
+    return "positive"
+  }
+  
+  else if (answer === ("Reply hazy, try again.") || answer === ("Ask again later.") || answer === ("Better not tell you now.") || answer === ("Cannot predict now.") || answer === ("Concentrate and ask again."))
+  {
+    return "negative"
+  }
+
+  else if (answer === ("Don't count on it.") || answer === ("My reply is no.") || answer === ("My sources say no.") || answer === ("Outlook not so good.") || answer === ("Very doubtful."))
+  {
+    return "very negative"
+  }
 }
 
 /* 
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index a10cc9ac2..dbda99125 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,20 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
-  return a + b + c;
+function addNumbers(a, b, c)
+{
+    return a + b + c;
 }
-
+  
 function introduceMe(name, age)
-  return "Hello, my name is " + name "and I am " age + "years old";
-
-function getTotal(a, b) {
-  total = a ++ b;
-
-  return "The total is total";
+{
+    return "Hello, my name is " + name + " and I am " + age + " years old";
+} 
+  
+function getTotal(a, b)
+{
+    total = a + b;
+  
+    return "The total is " + total;
 }
 
 /* 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 9cca7603b..ef284556e 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,18 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
-function trimWord(word) {
-  return wordtrim();
+function trimWord(word)
+{
+    return word.trim();
 }
-
-function getStringLength(word) {
-  return "word".length();
+  
+function getStringLength(word)
+{
+    return word.length;
 }
-
-function multiply(a, b, c) {
-  a * b * c;
-  return;
+  
+function multiply(a, b, c)
+{
+    return a * b * c;
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index 5a953ba60..680fd29d8 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,16 +1,20 @@
 // Add comments to explain what this function does. You're meant to use Google!
-function getRandomNumber() {
-  return Math.random() * 10;
+function getRandomNumber()
+{
+    //This function gets a random number between 0 and 1 and returns the result after multiplying the random number and the 10.
+    return Math.random() * 10;
 }
-
-// Add comments to explain what this function does. You're meant to use Google!
-function combine2Words(word1, word2) {
-  return word1.concat(word2);
+  
+  // Add comments to explain what this function does. You're meant to use Google!
+function combine2Words(word1, word2)
+{
+    //This function joins the two words together and then its returns the value.
+    return word1.concat(word2);
 }
-
-function concatenate(firstWord, secondWord, thirdWord) {
-  // Write the body of this function to concatenate three words together.
-  // Look at the test case below to understand what this function is expected to return.
+  
+function concatenate(firstWord, secondWord, thirdWord)
+{
+    return firstWord.concat(" ", secondWord, " ", thirdWord);
 }
 
 /* 
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index ba77c7ae2..66d439e67 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,10 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(num1)
+{
+    return num1 * 1.2;
+}
 
 /*
   CURRENCY FORMATTING
@@ -13,11 +16,13 @@ function calculateSalesTax() {}
   The business has informed you that prices must have 2 decimal places
   They must also start with the currency symbol
   Write a function that adds tax to a number, and then transforms the total into the format £0.00
-
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(num2)
+{
+    return "£" + calculateSalesTax(num2).toFixed(2);
+}
 
 /* 
 ===================================================