For the first question, another way to write -7/8 is:
B −[[7/8]].−[[7/8]].
This implies that -7/8 can be represented as the negative of 7/8.
For the second question regarding how many strips Francine was able to cut, without additional context or information from the example, I cannot provide a definitive answer. If you can provide more details or context about Francine's situation, I'd be happy to help with that as well!