<span>The RAID level 2 could give high
information exchange rates and would be straightforward contrasted with other
Raid levels. Be that as it may, it has a high cost and would need a high rate move
required with a specific end goal to legitimize this cost.</span>
Fist one correct.
second wrong because not all heat is used for work, some of it lost to other.
third wrong because fuel burn inside is called combustion engine
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True because printers, which require paper, are becoming more expensive. A paperless society has the advantage of being cheaper in this aspect.
You can try downloading some kind of computer cleaner like CleanMyMac X free version, also definitely restart your computer if you haven't done so already.