13 - 5 = 8 (eight classical music discs were bought.)
Answer:
Criminally negligent.
Explanation:
Negligence refers to the fact that you should have paid attention to details such as checking ID, calculating age, etc. but you didn't for one reason or another. This is a criminal act (apart from making an illegal sale) because it might lead to something more severe, like an accident or murder even, which might make you responsible for the crime.
