Final answer:
There are 4 people left in the bedroom after the murder.
Step-by-step explanation:
The question states that there are initially 34 people in the bedroom. If 30 of them are murdered, we need to subtract 30 from the initial number to find out how many are left.
34 - 30 = 4
Therefore, there are 4 people left in the bedroom after the murder.
Learn more about Subtraction