Answer:
20
Step-by-step explanation:
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. ...
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down.
or if you are looking for rounding to the nearest tenth it would be 18.0.
