diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..298d8547e 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,3 @@
 console.log("Hello world");
+
+console.log('Hello World. I just started learning JavaScript!');
\ No newline at end of file
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..dda09fb77 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,3 @@
 // Start by creating a variable `greeting`
-
-console.log(greeting);
+var greeting = "Hello world\n";  // added  backspace \n newline
+console.log(greeting.repeat(3)); // added repeat 3
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..ef45b58fa 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 stringType = typeof message;
 console.log(message);
+console.log(stringType);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..9711b61b5 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
+var greetingStart = "Hello, my name is ";
+var name = "Jay!";
+
+var message = greetingStart + name;
 
 console.log(message);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..9086d8eb9 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,8 @@
 // Start by creating a variable `message`
+var name = "Jonathan"; //  8 letters
+var nameLength = name.length;
+var greetingStart = "Hello, my name is Jonathan and my name is "  + nameLength + " letters long.";
+var message = greetingStart;
+
 
 console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..cf3c1c9dc 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,8 @@
-const name = " Daniel  ";
+var name = " Daniel  ";  //  6 letters long
+var nameTrim = name.trim();  //  need to trim the string first!
+var nameTrimLength = nameTrim.length;
+var greetingStart = "Hello, my name is Daniel and my name is ";
+var greetingEnd = " letters long.";
 
-console.log(message);
+
+console.log(greetingStart + nameTrimLength + greetingEnd );
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..3ceacc8c5 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,20 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+
+//Create two variables `numberOfStudents` and `numberOfMentors`
+//Log a message that displays the total number of students and mentors
+//Number of students: 15
+//Number of mentors: 8
+//Total number of students and mentors: 23
+
+
+var numberOfStudents = "Number of students: ";
+var numberOfMentors = "Number of mentors: ";
+var numberOfStudentsMentors = "Total number of students and mentors:";
+var students = 30;
+var mentors = 5;
+var totalClass = students + mentors; // 35
+
+console.log(numberOfStudents + students);
+console.log(numberOfMentors + mentors);
+console.log(numberOfStudentsMentors + totalClass);
+
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..6b1391fb7 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,22 @@
+//Percentage students: 65%
+//Percentage mentors: 35%
+
+
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+var studentsPer = "Percentage students: ";
+var mentorsPer = "Percentage mentors: ";
+var per = "%"
+var total = numberOfStudents + numberOfMentors; // 23
+//function for percentage
+function percentage (x,y) {
+  return  x/y*100;
+
+};
+var perRoundStud = Math.round(percentage(numberOfStudents,total)); // rounded up
+var perRoundMentor = Math.round(percentage(numberOfMentors,total)); // rounded up
+
+console.log(studentsPer + percentage(numberOfStudents,total) + per);
+console.log(mentorsPer + percentage(numberOfMentors,total) + per  );
+console.log(studentsPer + perRoundStud + per); // round down
+console.log(studentsPer + perRoundMentor + per); // round up
\ No newline at end of file
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..a8d91eee5 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,21 @@
+
+//Complete the function in exercise.js so that it halves the input
+
+//Try calling the function more than once with some different numbers
+
+// Remember to use the return keyword to get a value out of the function
+
+
+
+
+
 function halve(number) {
-  // complete the function here
+   return number/2;
 }
 
 var result = halve(12);
+var result2 = halve(50);
+
 
-console.log(result);
+console.log(result);   // half 12 = 6
+console.log(result2); //  half 50 = 25
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..ff303a3b8 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,7 +1,12 @@
+
+//Complete the function in exercise2.js so that it triples the input
+
+
 function triple(number) {
   // complete function here
+  return number*3;
 }
 
-var result = triple(12);
+var result = triple(12);  //  12 x 3 = 36
 
 console.log(result);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..d87d4b1a4 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,9 +1,20 @@
+
+//Write a function that multiplies two numbers together
+
+
+
+
 // 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`
 var result = multiply(3, 4);
+var result2 = multiply(6, 9);
+
+console.log(result); // 12  3x4=12
+console.log(result2); // 54 6x9=54
 
-console.log(result);
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..c5418663c 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,5 +1,13 @@
 // Declare your function first
+//From scratch, write a function that divides two numbers
+
+function divide (num1,num2) {
+    return num1/num2;
+}
+
 
 var result = divide(3, 4);
+var result2 = divide(100, 3);
 
-console.log(result);
+console.log(result);  // output 0.75
+console.log(Math.round(result2)); // rounded to 33 for 33.33333
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..55abdf61e 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,16 @@
 // Write your function here
+//Write a function that takes a name (a string) and returns a greeting
 
-var greeting = createGreeting("Daniel");
+var daniel ="Daniel";
+var susan ="Susan";
+var end = "!";
+function createGreeting (name) {
+
+return "Hello, my name is " + name + end;
+}
+
+
+var greeting = createGreeting(daniel);// added val Daniel
+var greeting = createGreeting(susan); // replaces Daniel with susan
 
 console.log(greeting);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..194b82f40 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,14 @@
+
+//Write a function that adds two numbers together
+//Call the function, passing `13` and `124` as parameters, and assigning the returned value to a variable `sum`
+
+
 // Declare your function first
+function addition (num1,num2){
+    return num1+num2;
+}
 
 // Call the function and assign to a variable `sum`
+var sum = addition(13,124);    // 13+124 = 134
 
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..f57ede92b 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,24 @@
+
+//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
+
+
+
+
+
 // 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);
 
 console.log(greeting);
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..f1a193470 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";
+
+ //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
+
+
+
+// main function
+function createGreeting (name,age){
+    return "Hello, my name is " + name  + " and I'm "  + age + " years old"
+}
+// array of names
+var array1 = ["Daniel","Irina","Mimi","Rob",
+ "Yohannes"];
+
+ function randomAge (min,max){
+    return  Math.random() * (min + max) + min;  
+ }
+var random = array1[Math.floor(Math.random()*array1.length)]; // picks names from array
+var ages = randomAge(10 , 60); // randoms age
+var agesRound = Math.round(ages);  // rounds age 
+const greeting = createGreeting(random,agesRound);
+
+console.log(greeting);
\ No newline at end of file
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 70a2fe863..9a307ddfe 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,17 +5,21 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(GDP) {
+return GDP * 1.4;
+}
 
-/*
-  CURRENCY FORMATTING
+  /*CURRENCY FORMATTING
   ===================
   The business is now breaking into the Brazilian market
   Write a new function for converting to the Brazilian real (exchange rate is 5.7 BRL to £)
   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(BRL) {
+  
+  return BRL/100*99* 5.7; //  99% of BRL X 5.7 = pounds
+}
 
 /* ======= 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..1f1f94c06 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,33 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(a,b) {
+var addTotal = a + b;
+return addTotal;
 }
 
-function multiply() {
-
+function multiply(c,d) {
+var multiplyTotal = c * d;
+return multiplyTotal;
 }
 
-function format() {
-
+function format(num1) {
+ return "£" + num1;
 }
 
-const startingValue = 2
+const startingValue = 2;
+let  addedTotal = add(startingValue, 10);
+let  multiTotal = multiply(addedTotal, 2);
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode = 
+let badCode =  format(add(multiply(startingValue,2),20));
+
+//looks messy hard to unerstand unsure if this is the right way???
 
 /* BETTER PRACTICE */
 
-let goodCode = 
+let goodCode = format(multiTotal);
+// more layed out. maybe a easier way to do this
 
 /* ======= 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..4735f2cf7 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -47,8 +47,10 @@
 // and return the answer.
 function shakeBall() {
   //Write your code in here
+  return "The ball has shaken!" + checkAnswer;
+  
 }
-
+console.log(shakeBall);
 /* 
   This function should say whether the answer it is given is
     - very positive
@@ -60,8 +62,18 @@ function shakeBall() {
 */
 function checkAnswer(answer) {
   //Write your code in here
+  var array1 = ["very positive" , "positive" , "negative" , "very negative"];
+ var random = array1[Math.floor(Math.random()*array1.length)]; // picks names from array
+ //var  veryPos = ["It is certain" , "It is decidedly so" , "Without a doubt" , "Yes - definitely" ,"You may rely on it"];
+ //var randomVP = veryPos[Math.floor(Math.random()*veryPos.length)]; // picks names from array
+ //var  pos = [ "As I see it, yes" , "Most likely" , "Outlook good" , "Yes" ,"Signs point to yes"];
+  //var  negative =[];
+  //var  very negative  = [];
+  
+ return random;
 }
 
+
 /* 
 ==================================
 ======= TESTS - DO NOT MODIFY =====
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..63adf185a 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,29 @@
-// There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+
+//Write a function that takes a name (a string) and an age (a number) and returns a greeting (a string)
+
+//## Expected result
+
+
+
+
+
+// There are syntax errors in this code - can you fix it to pass the tests?
+// addNumber adds a,b,c  missing comma's
+function addNumbers(a , b  , c) {
     return a + b + c;
 }
+// introduce adds a string with age and name missing +   , missing curly brackets, added spaces
+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";
-
+// getTotal adds a,b
+//removed a + (was a ++ b)
 function getTotal(a, b) {
-    total = a ++ b;
+   return  "The total is " + (a+b);
+
 
-    return "The total is total"
 }
 
 /* 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 3c578ad87..4cc2ee04b 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,23 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  //return wordtrim();
+  return word.trim();
 }
 
+
 function getWordLength(word) {
-  return "word".length();
+  
+  //return "word".length();
+  return word.length;
+
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+  //a * b * c;
+  //return;
+
+  return  (a*b*c);
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index c9221a200..3d70a280c 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -3,16 +3,31 @@ function getNumber() {
   return Math.random() * 10;
 }
 
+//  picking a random  number generator, multiplying by 10 
+
 // Add comments to explain what this function does. You're meant to use Google!
 function s(w1, w2) {
   return w1.concat(w2);
 }
 
+// concatenate  two words 
+
 function concatenate(firstWord, secondWord, thirdWord) {
+ return firstWord.concat( " ",secondWord ," " ,thirdWord);
+
+
+//return ("I", "like", "pizza"),
+ // ("I like pizza");
+
+//return  ("I", "am", 13),
+ // "I am 13"
+  
   // 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.
 }
 
+
+
 /* 
 ===================================================
 ======= TESTS - DO NOT MODIFY BELOW THIS LINE =====
@@ -43,6 +58,7 @@ test(
   concatenate("code", "your", "future"),
   "code your future"
 );
+
 test(
   "concatenate function - case 2 works",
   concatenate("I", "like", "pizza"),
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index c9e41c691..96b243e15 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(item) {
+  return  item/100*20+item;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,9 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(item) {
+  return "£" + (item/100*20+item).toFixed(2);
+}
 
 /* 
 ===================================================