diff --git a/js/formulas.js b/js/formulas.js
index 2435d53..076c906 100644
--- a/js/formulas.js
+++ b/js/formulas.js
@@ -1,80 +1,102 @@
 // Basic math formulaas
 function addition(num1, num2){
-  return -1;
+  let sum = num1 + num2;
+  return sum;
 }
 
+
 function subtraction(num1, num2){
-  return -1;
+  let difference = num1 - num2;
+  return difference;
 }
 
-function multiplication(num1, num2){
-  return -1;
+function multiplication(num1, num2) {
+let acc = num1*num2;
+  return acc;
+
 }
 
 function division(num1, num2){
-  return -1;
+  let div = num1/num2;
+  return div;
 }
 
 // Area formulaas
 function areaSquare(side){
-  return -1;
+let A = side*side;
+  return A;
 }
 
 function areaRectangle(length, width){
-  return -1;
+  let Rectangle = length*width;
+  return Rectangle;
 }
-
 function areaParallelogram(base, height){
-  return -1;
+  let Parallelogram = base*height;
+  return Parallelogram;
 }
 
 function areaTriangle(base, height){
-  return -1;
+  let Triangle = base*height*.5; 
+  return Triangle;
 }
 
 function Circle(radius){
-  return -1;
+  let Circle = Math.PI * radius * radius;
+  return Circle;
 }
 
 function Sphere(radius){
-  return -1;
+  let Sphere=4*Math.PI*radius*radius;
+  return Sphere;
 }
 
 // Surface Area formulas
 function surfaceAreaCube(side){
-  return -1;
+  let B=side*side*6;
+  return B
 }
 
 function surfaceAreaCylinder(radius, height){
-  return -1;
+  let Cylinder = radius*height*Math.PI*2;
+  return Cylinder
 }
 
 // Perimeter formulas
-function perimeterSquare(side){
-  return -1;
+function perimeterSquare(side) {
+let PS = 4*side;
+  return PS
 }
 
 function perimeterRectangle(length, height){
-  return -1;
+  let PR = 2*length+ 2*height;
+  return PR
 }
 
-function perimeterTriangle(side1, side2, side3){
-  return -1;
+function perimeterTriangle(side1, side2, side3){ 
+  let PT = side1 + side2 + side3; 
+  return PT
+  
+
 }
 
 function perimeterCircle(diameter){
-  return -1;
+  let PC = diameter*Math.PI;
+  return PC 
 }
 
 // Volume formulas
 function volumeCube(side){
-  return -1;
+  let VC=side*side*side;
+  return VC
 }
 
 function volumeRectangular(length, width, height){
-  return -1;
+  let VR = length*width*height;
+  return VR
 }
 
 function volumeCylinder(radius, height){
-  return -1;
+  VC = Math.PI*radius*radius*height;
+  return VC
 }