Which of these statements are incorrect?

Which of these statements are incorrect?

2) When a=9, b=12 and c=3 what will be the value of x for the expression x=9-12/3+3*2-1

3) If a and b are integers, then for a=14 and b=4 what will be the value of expression a/b.

4) What will be the output after compiling and running following code?

public class Test
  {
      public static void main(String... args)
    { 
         int x =5;
        x *= 3 + 7;
     System.out.println(x);
      }
}

5) When the operator ++ is placed after the variable name, first assignment of the value of the variable takes place and then the value of the variable is incremented, this operation is also called ………………………….. .