Explanation:
Concatenation allows you to add multiple strings together to form one long string by using the '+' operator between each string, so the purpose of concatenation is "<em>to combine two or more strings into one big string</em>" (third option).
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Personally responsibility
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Answer:
You can see an estimated battery life time.
Explanation:
To see it simply put your mouse over the battery icon, don't click it and it should give you the life it has left in hours:minutes format.
