It is 18 or 20
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Yes, -19 is an integer. An integer is any whole number, whether positive, negative, or zero. In this case, -19 is a negative whole number, making it an integer.
You can't write a non-integer as an integer. You can round it to the closest integer if you like, but it's not exactly the same number.
You would round it to 25.
12
To which decimal place? Closest Integer: 0 Closest Tenth: .1 Closest Hundreth: .10