diff --git a/lesson_06/expression/src/expression_calculator.ts b/lesson_06/expression/src/expression_calculator.ts
index 13cb2ca05..5a78dafed 100644
--- a/lesson_06/expression/src/expression_calculator.ts
+++ b/lesson_06/expression/src/expression_calculator.ts
@@ -2,10 +2,35 @@ export class ExpressionCalculator {
   /** Returns the calculation of ((a + b) * c) / d^e */
   calculate(a: number, b: number, c: number, d: number, e: number): number {
     // Implement your code here to return the correct value.
-    return 0;
+
+    // Caculate addition with an add function '(a + b)'
+    const originalSum = this.add(a, b);
+    // caculate multiplication '(add * c)'
+    const MultiplyMySum = this.multiply(originalSum, c);
+    //Specify the exponent 'd^e'
+    const myExponent = this.pow(d, e);
+    // caculate division 'multiply / exponent'
+    const DivideSum = this.divide(MultiplyMySum, myExponent);
+    // needs caculate it all...
+    const calculate = DivideSum;
+    return calculate;
+
+  }
+
+  add(x: number, y: number) {
+    return x + y;
+  }
+
+  multiply(x: number, y: number) {
+    return x * y;
+  }
+
+  divide(x: number, y: number) {
+    return x / y;
   }
 
   pow(base: number, exponent: number): number {
     return Math.pow(base, exponent);
   }
 }
+