The ratio of used books to new books is 9:4 because 13-4=9 and the ratio of all books to used books is 13:4 because there are 13 total books and 4 used books
The answer is 75 I asked Siri
The answer is D. check here for more details: https://prezi.com/hqgfggufngnw/under-which-operations-are-polynomials-closed/
Answer:
I think it’s H
Step-by-step explanation: