diff --git a/.DS_Store b/.DS_Store
index cd0c326..c924350 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/js/formulas.js b/js/formulas.js
index 2435d53..995eabc 100644
--- a/js/formulas.js
+++ b/js/formulas.js
@@ -1,80 +1,84 @@
-// Basic math formulaas
-function addition(num1, num2){
-  return -1;
-}
+function addition(num1, num2) {
+  
+return num1 + num2 ;
 
+}
 function subtraction(num1, num2){
-  return -1;
+return num1 - num2 ;
 }
 
 function multiplication(num1, num2){
-  return -1;
+  return num1 * num2;
 }
 
 function division(num1, num2){
-  return -1;
+
+  return num1 / num2 ;
 }
 
 // Area formulaas
 function areaSquare(side){
-  return -1;
+  
+  return side**2;
 }
 
 function areaRectangle(length, width){
-  return -1;
+  return length * width;
+
+
 }
 
 function areaParallelogram(base, height){
-  return -1;
+  return base * height;
 }
 
 function areaTriangle(base, height){
-  return -1;
+  return base * height / 2; 
 }
 
 function Circle(radius){
-  return -1;
+  return Math.PI * radius**2;
 }
 
 function Sphere(radius){
-  return -1;
+  return 4 * Math.PI * radius**2; 
 }
 
 // Surface Area formulas
 function surfaceAreaCube(side){
-  return -1;
+  return 6 * side * side ;
 }
 
 function surfaceAreaCylinder(radius, height){
-  return -1;
+  return (4 * Math.PI * radius * height) * (2 * Math.PI * radius**2);
 }
 
 // Perimeter formulas
 function perimeterSquare(side){
-  return -1;
+  return side + side + side + side;
 }
 
 function perimeterRectangle(length, height){
-  return -1;
+  return length + height + length + height;
 }
 
 function perimeterTriangle(side1, side2, side3){
-  return -1;
+  return side1 + side2 + side3;
 }
 
 function perimeterCircle(diameter){
-  return -1;
+  return Math.PI * diameter;
 }
 
 // Volume formulas
 function volumeCube(side){
-  return -1;
+  return side**3;
 }
 
 function volumeRectangular(length, width, height){
-  return -1;
+  return length * width * height;
 }
 
 function volumeCylinder(radius, height){
-  return -1;
+  return Math.PI * radius**2 * height;
 }