Q2. Identify if there is an error(s) or not, if it is correct the errors in each of the following: (4x10=40 points) 1. int i = 3; double ki + i; 2. double i 3.5; int k = Math.pow(1,2); 3. public class test 1 { public static void main(String[] args) { int i; System.out.println(i++); 4. public class Test // the output should be: The result is 5 public static void main(String[] args) { Scanner input-new Scanner(System.in); System.out.println("Please enter an integer:"); int number = input.nextInt(); // Assume that the user enters 5 System.out.println("The result is " + "number"); } } Q3. Write a program that evaluates the following expression: (28 points) r = 3xy + 2x - 3). (%2) for x= 2 and y 4; Using online Java compiler (such as Covida https://www.covidaio or Onlinegdb https://www.onlinegdb.com ), run the above code and show the output? Then manually, solve the equation illustrating each step, and compare your solution with output of the program