Answer: 39ft + 2in
Step-by-step explanation: Hello. Let's call 3ft 11in about 4ft. If you multiply 4 by 10, you get 40ft. Then, the difference between 3ft 11in and 4ft is about 1in. And since you multiplied 4ft by 10, you can also multiply 1in by 10. That gives you 10in, which you can subtract from 40ft to get 39ft and 2in. Hope this helps :)))