Add square, cube, and square_n_times functions

calculator.py

@@ -13,3 +13,24 @@ def divide(a,b):
 print("I'm going use the calculator functions to multiply 5 and 6")
 x = multiply(5,6)
 print(x)
+
+def square(x):
+    """Return x squared."""
+    return x ** 2
+
+
+def cube(x):
+    """Return x cubed."""
+    return x ** 3
+
+def square_n_times(number, n):
+    """Square the number n times and return the sum."""
+    total = 0
+    current = number
+
+    for _ in range(n):
+        current = current ** 2
+        total += current
+
+    return total
+