A librarian sorts 500 books at a constant rate. After 4 days, the librarian still has 250 books to sort. How much time does it take to sort the books from start to finish?

8 days.

Step-by-step explanation:

250 is half of 500

So 4 days takes half of the books.

The total would be 8 days because 4 is half of 8.

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step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.