Final answer:
Adding a dot to a note in music increases its duration by half of its original value.
Step-by-step explanation:
In music notation, adding a dot to a note increases its duration by half of its original value. So, if you have a whole note, adding a dot to it would make it equivalent to a whole note plus a half note. Likewise, if you have a half note and add a dot to it, it becomes equivalent to a half note plus a quarter note.