In the Greenwich Public Library, about one-tenth of the books are
overdue when they are returned. An
average of 580 books are returned
to the library each day. About how
many books could be expected to be
returned on time each day?

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?