E13.1 Given a class Rectangle with instance variables width and height, provide a recursive getArea method. Construct a rectangle whose width is one less than the original and call its getAreamethod.

E13.5 Write a recursive method String reverse(String text) that reverses a string. For example, reverse("Hello!") returns the string "!olleH". Implement a recursive solution by removing the first character, reversing the remaining text, and combining the two.

E13.10 Using recursion, find the largest element in an array. Hint: Find the largest element in the subset containing all but the last element. Then compare that maximum to the value of the last element.