Assume three strings of different lengths \( 78 \mathrm{~cm}, 117 \mathrm{~cm} \) and 351 cm cut into equal lengths. Find the greatest possible length of each piece.

A library has 3,489 non-fiction books, 8,617 fiction books and 1,240 reference books. 1. All books, except the reference books, ore available for loan. How many books arẹ available for loan?

2. Reference books are for use in the library. There are 16 bookshelves for the reference books. After use, they need to be returned to a special collection box for shelving. If 128 reference books are in use and 84 reference books are in the collection box. how many reference books are on the shelf?

Which of the following are rational numbers? Select all correct answers. Select all that apply: \( 0.7171171117 \ldots \) \( 0.0505505550 \ldots \) \( 0.6262626262 \ldots \) 4.8 \( \square \sqrt{13} \) \( \square \) \( \square \)

Which of the following is an integer? Select all correct answers. Select all that apply: \( \square \frac{49}{6} \) \( \square-5 \) \( \square 8 \) \( \square-10 \) \( \square \frac{29}{3} \)

4. The population of a city is 67,721 and the neighboring city has a population of 52,103 . The difference between two cities is