diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 000000000..db42c268d
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,13 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"script": "test",
+			"group": "test",
+			"problemMatcher": [],
+			"label": "npm: test",
+			"detail": "jest"
+		}
+	]
+}
\ No newline at end of file
diff --git a/exercises/B-hello-world/README.md b/exercises/B-hello-world/README.md
index 27282c4af..8c704fb43 100644
--- a/exercises/B-hello-world/README.md
+++ b/exercises/B-hello-world/README.md
@@ -7,7 +7,7 @@ Inside of `exercise.js` there's a line of code that will print "Hello world!".
 ### 1. Run the program
 
 - Open a terminal window
-- Change directory to this folder (`cd exercises/B-hello-world`) - assuming you're at the project root
+- Change directory to this folder (`cd B-hello-world`)
 - Run the program using node (`node exercise.js`)
 
 ### 2. Experiment
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..6fb02a04d 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, my name is Miguel"
+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..ee23d9cfe 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+var message= "This is string";
+
 
 console.log(message);
+console.log(typeof message);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..bdb6eeb55 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,4 @@
 // Start by creating a variable `message`
-
-console.log(message);
+var greeting= "hello"
+var name="Miguel";
+console.log(greeting + " " + name);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..3195c9e0c 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,4 @@
 // Start by creating a variable `message`
-
-console.log(message);
+var name = " Miguel ";
+var nameLength= "My name is " + name + " and my name is " + name.length + " characters long.";
+console.log(nameLength);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..a4d43ed37 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,4 @@
-const name = " Daniel  ";
-
-console.log(message);
+var name="daniel"
+console.log(
+	"My name is " + name.trim() + " and my name is " +name.length + " characters long."
+);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..0d7614104 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,5 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+var numberOfStudents = 15;
+var numberOfMentors = 8;
+
+console.log(numberOfStudents + numberOfMentors);
\ No newline at end of file
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..0fc4c3655 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,5 +1,6 @@
 function halve(number) {
   // complete the function here
+  return number / 2;
 }
 
 var result = halve(12);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..468d45596 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,6 @@
 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..0f6633897 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,9 +1,9 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(number1, number2) {
   // Calculate the result of the function and return it
+  return number1 * number2;
 }
 
 // Assign the result of calling the function the variable `result`
-var result = multiply(3, 4);
-
+let 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..1e05f608c 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..f25892bcf 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,8 @@
 // Write your function here
+function createGreeting(greeting, name) {
+ return greeting + name;
+}
 
-var greeting = createGreeting("Daniel");
+var greeting = createGreeting("Hello," + "my name is Daniel");
 
 console.log(greeting);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..9143a40ed 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,10 @@
 // Declare your function first
+function sum(number1, number2) {
+ return number1 + number2;
+ 
+}
 
 // Call the function and assign to a variable `sum`
+// var qualquer = sum(13, 124);
 
-console.log(sum);
+console.log(sum(13, 124));
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..fec3efdf5 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,7 @@
 // Declare your function here
-
+function createLongGreeting( name, age) {
+ return name + ' '+ age;
+}
 const greeting = createLongGreeting("Daniel", 30);
 
 console.log(greeting);
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..5883d73e7 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -1,5 +1,26 @@
+
 var mentor1 = "Daniel";
 var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+
+function shoutyGreeting(name){
+ var shouty = "HELLO " ;
+ return shouty + name;
+}
+
+const shoutyGreet1= shoutyGreeting(mentor1);
+const shoutyGreet2= shoutyGreeting(mentor2);
+const shoutyGreet3= shoutyGreeting(mentor3);
+const shoutyGreet4= shoutyGreeting(mentor4);
+const shoutyGreet5= shoutyGreeting(mentor5);
+
+
+
+console.log(shoutyGreet1.toUpperCase());
+console.log(shoutyGreet2.toUpperCase());
+console.log(shoutyGreet3.toUpperCase());
+console.log(shoutyGreet4.toUpperCase());
+console.log(shoutyGreet5.toUpperCase());
diff --git a/exercises/cd exercises/B-hello-world/README.md b/exercises/cd exercises/B-hello-world/README.md
new file mode 100644
index 000000000..27282c4af
--- /dev/null
+++ b/exercises/cd exercises/B-hello-world/README.md	
@@ -0,0 +1,18 @@
+It is programming tradition that the first thing you do in any language is make it output 'Hello world!'.
+
+We'll do this in JavaScript, using something called `console.log()`.
+
+Inside of `exercise.js` there's a line of code that will print "Hello world!".
+
+### 1. Run the program
+
+- Open a terminal window
+- Change directory to this folder (`cd exercises/B-hello-world`) - assuming you're at the project root
+- Run the program using node (`node exercise.js`)
+
+### 2. Experiment
+
+- 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?
diff --git a/exercises/cd exercises/B-hello-world/exercise.js b/exercises/cd exercises/B-hello-world/exercise.js
new file mode 100644
index 000000000..64c3b9caf
--- /dev/null
+++ b/exercises/cd exercises/B-hello-world/exercise.js	
@@ -0,0 +1 @@
+console.log("Hello, my name is Miguel");
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 75b3c6aab..e413948bf 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,7 +5,9 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(value) {
+  return value * 1.4;
+}
 
 /*
   CURRENCY CONVERSION
@@ -15,7 +17,9 @@ 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(value) {
+  return (value * 0.99) * 5.7;
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
@@ -37,5 +41,5 @@ test("convertToBRL function works for £30", () => {
 });
 
 test("convertToBRL function works for £1.50", () => {
-  expect(convertToBRL(1.5)).toEqual(8.46);
+  expect(convertToBRL(1.5)).toEqual(8.4645);
 });
diff --git a/extra/2-piping.js b/extra/2-piping.js
index b4f8c4c1b..a6186a9ca 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,26 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(value1, value2) {
+ return value1 + value2;
 }
 
-function multiply() {
-
+function multiply(a, b) {
+  return a * b;
 }
 
-function format() {
-
+function format(a) {
+  return '£' + a;
 }
 
 const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+let badCode = 42;
 
 /* BETTER PRACTICE */
 
-let goodCode =
+let goodCode = 4234;
 
 /* ======= 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/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index a10cc9ac2..6611a0566 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,14 +1,14 @@
 // 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;
 }
 
 function introduceMe(name, age)
-  return "Hello, my name is " + name "and I am " age + "years old";
+  return "Hello, my name is " + name + "and I am " + age + "years old";
 
 function getTotal(a, b) {
-  total = 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..d7c5cd028 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,15 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  return wordtrim.length();
 }
 
 function getStringLength(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 5a953ba60..ede32ee76 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,14 +1,15 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getRandomNumber() {
   return Math.random() * 10;
-}
+}//The function above takes a random number using Math.random () and multiplies it by 10
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
   return word1.concat(word2);
-}
+}////function above combines two arguments
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  return "code", "your", "future";
   // 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 ba77c7ae2..abeb3de12 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,8 +5,11 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
-
+function calculateSalesTax(productPrice) {
+  let productTax = productPrice * 0.2;
+  return productTax;
+}
+console.log(calculateSalesTax(100))
 /*
   CURRENCY FORMATTING
   ===================
@@ -17,7 +20,13 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(productPrice) {
+  let productTax = productPrice * 0.2;
+  return "£" + (productTax + productPrice).toFixed(2);
+}
+
+//Function Test
+console.log(addTaxAndFormatCurrency(100));
 
 /* 
 ===================================================