diff --git a/lesson_06/expression/src/expression_calculator.ts b/lesson_06/expression/src/expression_calculator.ts
index 13cb2ca05..dc3c5bc75 100644
--- a/lesson_06/expression/src/expression_calculator.ts
+++ b/lesson_06/expression/src/expression_calculator.ts
@@ -1,11 +1,23 @@
 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;
+  add(a: number, b: number): number {
+    return a + b;
+  }
+  divide(a: number, b: number): number {
+    return a / b;
+  }
+  multiply(a: number, b: number): number {
+    return a * b;
   }
-
   pow(base: number, exponent: number): number {
     return Math.pow(base, exponent);
   }
+  calculate(a: number, b: number, c: number, d: number, e: number): number {
+    // Implement your code here to return the correct value.
+
+    let result = this.add(a, b);
+    result = this.multiply(result, c);
+    result = this.divide(result, this.pow(d, e));
+    return result;
+  }
 }