How does adding a dot to the right of a note change its value?

A dot that is placed after the note to indicate a change in the duration of a note. The dot adds half of the value of the note to itself. For example, a dotted half note gets 3 beats - value of a half note is 2, half of 2 is 1 so 2 + 1 = 3.

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she has insufficient time to complete her important tasks

hope this : )