Sometimes the indefinite article "a" is used with each adjective and sometimes not. What is the rule? This is an important and an expensive newspaper OR This is important and expensive newspaper OR what was shown?
When you have a demonstrative plus a word with ال, it means "this ____". (هذه الصحيفة = this newspaper). When you have a demonstrative plus a word without ال, it means "this is a" (هذه صحيفة = this is a newspaper).