diff --git a/src/index.js b/src/index.js
index bea6dce..d44eb7a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,35 +1,87 @@
 // 1. Add function code goes here
-exports.add = function add() {};
+exports.add = function add(x, y) {
+  return x + y
+};
 
 // 2. Multiply function code goes here
-exports.multiply = function multiply() {};
+exports.multiply = function multiply(x, y) {
+  return x * y
+};
 
 // 3. OddOrEven function code goes here
-exports.oddOrEven = function oddOrEven() {};
+exports.oddOrEven = function oddOrEven(x) {
+  if(x % 2 == 0) {
+    return ('even')
+  } else {
+    return ('odd')
+  }
+};
 
 // 4. Write a function that returns an array that includes number 1 to 100
 // Ex: [1,2,3,4, ..., 99, 100]
-exports.arrayGenerator = function arrayGenerator() {};
+exports.arrayGenerator = function arrayGenerator() {
+  let numbers = [];
+  for(i=1; i<=100; i++) {
+    numbers.push(i);
+  }
+  return(numbers);
+};
 
 // 5. Fix this function. We want to see 2 in the console instead of undefined
 exports.hoisting = function hoisting() {
-  console.log(y); // undefined
   let y = 2;
+  return (y);
 };
 
 // 6. Write a function that accepts unlimited amount of numbers as input
 // and return the smallest value
-exports.minValue = function minValue() {};
+exports.minValue = function minValue(...numbers) {
+  return Math.min(...numbers);
+  };
 
 // 7. Write a function that accepts an array of numbers as input
 // and return a new array with all numbers doubled
 // Ex: [1,2,3] => [2,4,6]
-exports.doubleArray = function doubleArray() {};
+exports.doubleArray = function doubleArray(input) {
+	return input.map(x => x * 2);
+};
 
 // 8. We have an array of students object, each object will have a name property
 // write a function that accepts a student array as first parameter, and a name as second parameter
 // and return the student with that name
 // Example of student array: const students = [{ name: 'a' }, { name: 'b' }];
-exports.findStudentName = function findStudentName() {};
+exports.findStudentName = function findStudentName (studentList, name) {
+  return studentList.filter(student => student.name === name);
+};
 
 // 9. Transform all of the above into arrow functions below here
+
+// 1. ADD 
+const add = (x, y) => x + y;
+
+// 2. MULTIPLY 
+const multiply = (x, y) => x * y;
+
+// 3. ODDOREVEN 
+const oddOrEven = (x) => (x % 2 == 0) ? 'even' : 'odd';
+
+// 4. ARRAYGENERATOR
+const arrayGenerator = () => {
+  let numbers = [];
+  for(i=1; i<=100; i++) {
+    numbers.push(i);
+  }
+  return(numbers);
+};
+
+// 5. HOISTING 
+const hoisting = () => y = 2;
+
+// 6. MINVALUE 
+const minValue = (...numbers) => Math.min(...numbers);
+
+// 7. DOUBLEARRAY
+const doubleArray = (input) => input.map(x => x * 2);
+
+// 8. FINDSTUDENTNAME
+const findStudentName = (studentList, name) => studentList.filter(student => student.name === name);