diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..b5d352779 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1 @@
-console.log("Hello world");
+console.log('Hello Jiahd');
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..628a44964 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,6 @@
 // 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..731eff86b 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,9 @@
 // Start by creating a variable `message`
 
-console.log(message);
+
+
+var message = "This is a string";
+var messageType = typeof message;
+
+console.log(messageType); 
+
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..10882baf8 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,10 @@
 // Start by creating a variable `message`
 
-console.log(message);
+
+
+var greetingStart = "Hello, my name is ";
+var name = "JIHAD";
+
+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..915fbadd0 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,11 @@
+
+
+
 // Start by creating a variable `message`
+var name = "Jihad";
+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..14701f7a6 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,10 @@
-const name = " Daniel  ";
 
-console.log(message);
+
+
+
+var name = "Jihad";
+var nameLength = name.length;
+var message = 'My Name is ' + name + ' and my name is ' + nameLength +   ' characters long';
+
+
+console.log(message.trim())
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..bc147e7be 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,16 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+
+
+var  numberOfStudents =  15
+var  numberOfMentors =  8
+var Total = numberOfStudents + numberOfMentors;
+
+
+
+// Number of students: 15
+// Number of mentors: 8
+// Total number of students and mentors: 23
+
+console.log('number of studets is : ' + numberOfStudents)
+console.log('number of Mentors is : ' + numberOfMentors)
+console.log('Total number of students and mentors: ' + Total)
\ No newline at end of file
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..f64051053 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,26 @@
+
+
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+
+var total = numberOfStudents + numberOfMentors;
+
+// console.log(total)
+
+
+
+var PercentageStudents = numberOfStudents / total;
+var PercentageMentors = numberOfMentors / total;
+
+
+var StudentsRound = Math.round(PercentageStudents * 100);
+var MentorssRound = Math.round(PercentageMentors * 100);
+
+
+console.log('Percentage students: ' + StudentsRound);
+console.log('Percentage Mentors: ' + MentorssRound);
+
+
+// // Percentage students: 65%
+// // Percentage mentors: 35%
+// // ```
\ No newline at end of file
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..bd6133c6f 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,5 +1,7 @@
 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..a70b80b09 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..c15480416 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,6 @@
 // Complete the function so that it takes input parameters
-function multiply() {
-  // Calculate the result of the function and return it
+function multiply(a, b) {
+  return a * b;
 }
 
 // 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..72e09b5e4 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,5 +1,7 @@
-// Declare your function first
+function divide(a, b) {
 
+return a /b ;
+}
 var result = divide(3, 4);
 
 console.log(result);
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..bf86c392e 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,22 @@
-// 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..07b628866 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,10 @@
-// Declare your function first
+function total(a, b) {
+return a + b;
+
+}
 
 // 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..6459f36d1 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,4 +1,8 @@
 // Declare your function here
+function createLongGreeting(name, age) {
+return `Hello, my name is ${name} and I'm ${age} years old`;
+
+}
 
 const greeting = createLongGreeting("Daniel", 30);
 
diff --git a/exercises/L-functions-nested/README.md b/exercises/L-functions-nested/README.md
index 1c4ae9c8a..78b3af2b2 100644
--- a/exercises/L-functions-nested/README.md
+++ b/exercises/L-functions-nested/README.md
@@ -23,7 +23,7 @@ function createCreeting(name, age) {
 - Your program should include a function that spells their name in uppercase, and a function that creates a shouty greeting.
 - Log each greeting to the console.
 
-## Expected result
+## Expected result-
 
 ```
 HELLO DANIEL
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..2029c806b 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 upperName(name) {
+    return name.toUpperCase()
+}
+
+function greeting(name) {
+
+    var upperspell = upperName(name)
+    var massage = 'Hello ' + name;
+    return massage;
+}
+console.log(greeting(mentor1));
+console.log(greeting(mentor2));
+console.log(greeting(mentor3));
+console.log(greeting(mentor4));
+console.log(greeting(mentor5));
\ No newline at end of file
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index a10cc9ac2..23af66ae3 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,19 @@
 // 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 (parseInt(a) + parseInt(b) + parseInt(c));
+}
+
+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";
 
 function getTotal(a, b) {
-  total = a ++ b;
+   let total = a + b;
+
 
-  return "The total is total";
+  return (`The total is ${total}`);
 }
 
 /* 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 9cca7603b..dc731729d 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();
+  return word.trim();
 }
 
 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..5cda37c05 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -2,15 +2,22 @@
 function getRandomNumber() {
   return Math.random() * 10;
 }
+// The Math.random() function returns a floating-point, pseudo-random number in the range 0 to less than 1 (inclusive of 0, but not 1)
+//  with approximately uniform distribution over that range — which you can then scale to your desired range. 
+
+
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
   return word1.concat(word2);
 }
 
+// The concat() method concatenates the string arguments to the calling string and returns a new string
+
 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.
+
+  return firstWord.concat(" ", secondWord, " ", thirdWord)
+  
 }
 
 /* 
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index ba77c7ae2..69925ceb4 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,14 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(num) {
+  
+  return  num * 1.2;
+
+
+}
+
+
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +24,10 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(num) {
+return '£' + (num * 1.2).toFixed(2);
+
+}
 
 /* 
 ===================================================