diff --git a/exercises/A-setup-ide/README.md b/exercises/A-setup-ide/README.md
index 1412871b6..b08a75aad 100644
--- a/exercises/A-setup-ide/README.md
+++ b/exercises/A-setup-ide/README.md
@@ -2,12 +2,15 @@ There are some tools that will help you to write code. One of these, [Prettier](
 
 ### 1. Install prettier
 
-* In Visual Studio open the extensions panel (see https://code.visualstudio.com/docs/editor/extension-gallery#_browse-and-install-extensions)
-* Search for `Prettier - Code formatter`
-* Click install on the top result
+- In Visual Studio open the extensions panel (see https://code.visualstudio.com/docs/editor/extension-gallery#_browse-and-install-extensions)
+- Search for `Prettier - Code formatter`
+- Click install on the top result
 
 ### 2. Enable formatting on save
 
-* In Visual Studio open the settings file (see https://code.visualstudio.com/docs/getstarted/settings#_creating-user-and-workspace-settings)
-* Search for `editor format`
-* Set `editor.formatOnSave` and `editor.formatOnPaste` to true
+- In Visual Studio open the settings file (see https://code.visualstudio.com/docs/getstarted/settings#_creating-user-and-workspace-settings)
+- Search for `editor format`
+- Set `editor.formatOnSave` and `editor.formatOnPaste` to true
+
+xxxx
+All done for WSL-Ubuntu version
diff --git a/exercises/B-hello-world/README.md b/exercises/B-hello-world/README.md
index a7b891d56..7c26e967e 100644
--- a/exercises/B-hello-world/README.md
+++ b/exercises/B-hello-world/README.md
@@ -14,5 +14,5 @@ Inside of `exercise.js` there's a line of code that will print "Hello world!".
 
 * Try to `console.log()` something different. For example, 'Hello World. I just started learning JavaScript!'.
 * Try to console.log() several things at once.
-* What happens when you get rid of the quote marks?
-* What happens when you console.log() just a number without quotes?
+* What happens when you get rid of the quote marks?>>>>SyntaxError: missing ) after argument list
+* What happens when you console.log() just a number without quotes?>>>>Without quotes it's just a number but with quotes it's string
diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..12ceda5f0 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,4 @@
-console.log("Hello world");
+
+console.log('Hello World.I just started learning JavaScript!');
+console.log(2021);
+console.log('2021');
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..d0d1cdf61 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..abadf27ed 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,12 @@
 // Start by creating a variable `message`
+var message = 'This is a  string';
+var messageType = typeof message;
+var messageOther = 'Here is an other string';
+var messageType = typeof messageOther;
+var messageAnother = 'There is an another string';
+var messageType = typeof messageAnother;
 
 console.log(message);
+console.log(messageOther);
+console.log(messageAnother);
+
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..e92df87e9 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+var greetingStart ='Hello, My name is ';
+var name ='Adem';
 
-console.log(message);
+var greeting = greetingStart + name;
+console.log(greeting);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..40f8c81f8 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
+const name ='Adem';
+const greetings ='My name is '+ name +' and my name is '+name.length +' characters long';
+console.log(greetings);
+
+
 
-console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..88175fc87 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,5 @@
-const name = " Daniel  ";
+const name ='  Adem  ';
+const noWhiteSpace = name.trim();
+const greetings ='My name is '+ noWhiteSpace +' and my name is '+ noWhiteSpace.length +' characters long';
+console.log(greetings);
 
-console.log(message);
diff --git a/exercises/G-numbers/README.md b/exercises/G-numbers/README.md
index 4c6f45a41..76a79dab2 100644
--- a/exercises/G-numbers/README.md
+++ b/exercises/G-numbers/README.md
@@ -17,8 +17,8 @@ var difference = 10 - 2; // 8
 
 ## Exercise
 
-* Create two variables `numberOfStudents` and `numberOfMentors`
-* Log a message that displays the total number of students and mentors
+- Create two variables `numberOfStudents` and `numberOfMentors`
+- Log a message that displays the total number of students and mentors
 
 ## Expected result
 
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..a98aa499e 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,13 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+var numberOfStudents =15;
+var numberOfMentors =8;
+var sum = numberOfStudents + numberOfMentors;
+// var product =numberOfStudents * numberOfMentors;
+// var quotient=numberOfStudents / numberOfMentors;
+// var difference =numberOfStudents - numberOfMentors
+console.log('Number of students:'+ numberOfStudents);
+console.log('Number of  mentors:'+ numberOfMentors);
+console.log('Total number of students and mentors:'+ sum);
+// console.log(product);
+// console.log(quotient);
+// console.log(difference);
\ No newline at end of file
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..f512c4523 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,8 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+const total =numberOfStudents + numberOfMentors;
+let percentageOfStudents = Math.round(numberOfStudents/total*100);
+let percentageOfMentors = Math.round(numberOfMentors/total*100);
+console.log('Percentage Of Students:' + percentageOfStudents +'%');
+console.log('Percentage Of Mentors:' + percentageOfMentors +'%');
+
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..011261f4f 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,14 @@
 function halve(number) {
-  // complete the function here
+  return number/2;
 }
 
 var result = halve(12);
-
+var result2 = halve(14);
+var result3 = halve(16);
+var result4 = halve(18);
+var result5 = halve(20);
 console.log(result);
+console.log(result2);
+console.log(result3);
+console.log(result4);
+console.log(result5);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..a57a8d69a 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,5 @@
 function triple(number) {
-  // complete function here
+  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..5be5c19c2 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,7 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(num1,num2) {
   // Calculate the result of the function and return it
+  return num1*num2;
 }
 
 // Assign the result of calling the function the variable `result`
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..e973665ee 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(num1,num2){
+    return num1/num2;
+
+}// Declare your function first
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..230d0fd4d 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,4 +1,6 @@
-// Write your function here
+function createGreeting(name){
+    return 'Hello, my name is ' + name;
+}// Write your function here
 
 var greeting = createGreeting("Daniel");
 
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..18506ae42 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,7 @@
 // Declare your function first
-
+function total(num1,num2){
+    return num1+num2;
+}
 // Call the function and assign to a variable `sum`
-
+var sum =total(13,124);
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..4efdc26b7 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,14 @@
 // Declare your function here
-
+function createLongGreeting(name , age){
+    return 'Hello, my name is '+ name +' I am '+ age + ' years old'
+}
 const greeting = createLongGreeting("Daniel", 30);
 
 console.log(greeting);
+
+// * Write a function that takes a name (a string) and an age (a number) and returns a greeting (a string)
+
+// ## Expected result
+
+// ```
+// Hello, my name is Daniel and I'm 30 years old
\ No newline at end of file
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..dbf20620a 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -1,5 +1,14 @@
-var mentor1 = "Daniel";
-var mentor2 = "Irina";
-var mentor3 = "Mimi";
-var mentor4 = "Rob";
-var mentor5 = "Yohannes";
+
+function percentage(num,total){
+   return Math.round(num/total*100);
+
+};
+
+function result(num,total){
+ const equal = percentage(num,total);
+ return equal;
+
+}
+console.log('percentage students: '+ result(15,23)+'%');
+console.log('percentage mentors: '+ result(8,23)+'%');
+
diff --git a/exercises/L-functions-nested/exercise2.js b/exercises/L-functions-nested/exercise2.js
new file mode 100644
index 000000000..62c457b64
--- /dev/null
+++ b/exercises/L-functions-nested/exercise2.js
@@ -0,0 +1,22 @@
+var mentor1 = "Daniel";
+var mentor2 = "Irina";
+var mentor3 = "Mimi";
+var mentor4 = "Rob";
+var mentor5 = "Yohannes";
+
+function upperName(name){
+
+    return name.toUpperCase()
+};
+
+function shoutyGreeting(name){
+    var message = 'HELLO' + upperName(name);
+    return message;
+
+};
+
+console.log(shoutyGreeting(' Daniel'));
+console.log(shoutyGreeting(' Irina'));
+console.log(shoutyGreeting(' Mimi'));
+console.log(shoutyGreeting(' Rob'));
+console.log(shoutyGreeting(' Yohannes'));
\ No newline at end of file
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 70a2fe863..781078767 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(price) {
+  return price*1.4;
+
+}
 
 /*
   CURRENCY FORMATTING
@@ -15,7 +18,9 @@ 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(price) {
+  return (price*5.7)*0.99;
+}
 
 /* ======= 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 067dd0f5b..e502a4f0f 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,36 @@
   the final result to the variable goodCode
 */
 
-function add() {
 
-}
+function add(number1,number2) {
 
-function multiply() {
+   return number1+number2;
+}
 
+function multiply(number1,number2) {
+    return number1*number2;
 }
 
-function format() {
+function format(number3) {
+    return "£"+number3;
 
 }
 
 const startingValue = 2
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode = 
+//It's hard to read it
+//  - add 10 to startingValue
+//   - multiply the result by 2
+//   - format it
 
-/* BETTER PRACTICE */
 
-let goodCode = 
+let badCode = format(multiply(add(startingValue,10),2)); 
+
+/* BETTER PRACTICE */
+let total = add(startingValue,10);
+let product = multiply(total,2)
+let goodCode = format(product);
 
 /* ======= 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 e32182cfe..f5a614921 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -45,21 +45,67 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
+
+var givenAnswers= [ 
+    "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.",
+
+ 
+    "Do not count on it.",
+    "My reply is no.",
+    "My sources say no.",
+    "Outlook not so good.",
+    "Very doubtful.",
+  ];
+
+
 function shakeBall() {
-  //Write your code in here
+  console.log ("The ball has shaken!");
+  var randomAnswer = Math.floor(Math.random()*19);
+  return givenAnswers[randomAnswer];
 }
 
-/* 
-  This function should say whether the answer it is given is
-    - very positive
-    - positive
-    - negative
-    - very negative
+ 
+  // *This function should say whether the answer it is given is
+  //   - very positive
+  //   - positive
+  //   - negative
+  //   - very negative
+
+    // *This function should expect to be called with any value which was returned by the shakeBall function.
 
-  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
+  var xxxx
+  if (){
+    return 'very positive'
+  }
+   else if (){
+    return 'positive'
+  }
+   else if (){
+    return 'negative'
+  }
+   else {
+    return 'very negative'
+  }
+
 }
 
 /* 
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..fd187c227 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,28 +1,32 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+function addNumbers(a,b,c) {
     return a + b + c;
 }
+// console.log(addNumbers(3, 4, 6));
 
-function introduceMe(name, age)
-return "Hello, my name is " + name "and I am " age + "years old";
+function introduceMe(name, age){
+    return "Hello, my name is " + name + " and I am "+ age + " years old";
+}
+// console.log(introduceMe("Sonjide",27));
 
 function getTotal(a, b) {
-    total = a ++ b;
+   var total = a + b;
 
-    return "The total is total"
+    return "The total is "+ total;
 }
+// console.log(getTotal(23,5));
 
-/* 
-===================================================
-======= TESTS - DO NOT MODIFY BELOW THIS LINE =====
+// /* 
+// ===================================================
+// ======= TESTS - DO NOT MODIFY BELOW THIS LINE =====
 
-There are some Tests in this file that will help you work out if your code is working.
+// There are some Tests in this file that will help you work out if your code is working.
 
-To run these tests type `node 1-syntax-errors.js` into your terminal
+// To run these tests type `node 1-syntax-errors.js` into your terminal
 
-===================================================
-*/
+// ===================================================
+// */
 
 const util = require('util');
 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 3c578ad87..1429cacc3 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,16 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  return word.trim();
 }
 
 function getWordLength(word) {
-  return "word".length();
+  return word.length;
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+    return a * b * c;
+
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index c9221a200..c4130448b 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,14 +1,19 @@
 // Add comments to explain what this function does. You're meant to use Google!
+//returns a random number between 0 (inclusive) and 1 (exclusive) and multiplies with 10
 function getNumber() {
   return Math.random() * 10;
 }
+// console.log(getNumber());
 
 // Add comments to explain what this function does. You're meant to use Google!
+//combines typed array with the new array.
 function s(w1, w2) {
   return w1.concat(w2);
 }
+// console.log(s);
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  return firstWord.concat(" " + 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.
 }
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index c9e41c691..492393bf7 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,9 @@
   Sales tax is 20% of the price of the product
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  return price+price*0.2;
+  }
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,12 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(price) {
+  
+  var decimalSellingPrice = calculateSalesTax(price).toFixed(2);
+  return "£"+ decimalSellingPrice;
+
+}
 
 /* 
 ===================================================