Answer:
The tone of the letter by the Freedmen's Bureau teacher shows fear and apprehension. The teacher expresses concern about the state of the freedmen and their well-being, as well as their lack of education and resources. The teacher also expresses a sense of responsibility for the freedmen, but acknowledges the difficulty of the task they face. The teacher's tone is one of urgency, as they urge the federal government to take action to help the freedmen.