Please answer this correctly without making mistakes

Answer:
3ft 11in
Step-by-step explanation:
you need to break the 7ft into 6ft and 12in. Then subract the 6ft by the 3ft and the 12in by the 1in.
Answer:
3ft 11 inches
Step-by-step explanation:
This is the answer because you subtract 7 by 3 which is 4 now subtract one in while in feet that is 3 ft 11 inches