65 is an integer. If you meant 6.5, then it rounds to 7. If you meant 0.65, it rounds to 1.
-65
It is 18 or 20
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
-65
No - 0.8 is a decimal number, not an integer. The closest integer is 1.
8 is an integer, so the answer is 8
-65
The whole number closest to the square root of 65 is 8. The whole number closest to the square root of 65 is 8.
It is 18 or 20
65 is an integer and there is no sensible way to express it as a fraction.
65 is an integer and not a fraction. However, it can be expressed in rational form as 65/1 which cannot be simplified.
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.
-132
12