Answer
program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface (API). In addition, users can interact directly with the operating system through a user interface such as a command line or a graphical user interface
Answer:
It will just print 5*4+5 .
But you still need to add " ".
Answer:
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Explanation:
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1. I believe it this, they way the question is phrased it seems like a personal opinion. But if we're being logical about this, no one likes background noise. So,yes, it's important.
2. Yes, when you record something you don't want additional sound that has nothing to do with what you're recording.
3.Yes, your main task is to be focused on what you're doing on the computer. You don't want to be distracted by unnecessary distractions.