When the above code is compiled, wh why? at error message will be generated and 9. Why is the following relational operator expression inv invalid? How could you rewrite the statement so that it is valid? boolean isGradePassing (grade> 10. char aCharacter 2: int aNumber'2" In the above statements, what values will be output after aprintln) statement is executed? Why are the output results different for t statements? 11. alter the following statement to display "Welcome" on one line How could you and "back" on another line? system.out.println ("Nelcome back")