Homework:
- Is it possible to mark some cells in a 6x8 array with x's so that each row has exactly 3 x's and each column exactly 2 x's?
- Find all x such that |x|+|x-2|≤ 4.
- The side disks of a spool are twice the radius of the inner cylinder. If one pulls the line, which way the spool will roll? (There is no sliding.)
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