answers from question 4 to question 6.

Sir, these are the answers from question 4 to question 6.

Answere no.4:-

console.log('Albert Einstein once said,"Life is like riding a bicycle. To keep your balance, you must keep moving."')        

Answere no.5:-

 let FamousPerson = 'Albert Einstein';
let message = '"Life is like riding a bicycle. To keep your balance, you must keep moving."';
console.log(FamousPerson +' once said' + ',' + message        )        

Answere no.6:-

  const PersonsName = '\n\tHassan\n\n\t';
console.log(PersonsName);
const without_whitespace = PersonsName.trim();
console.log(without_whitespace);        

and Solved...