will N and chris M's Puzzle

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Across
  1. 2. A letter or symbol used to represent a quantity that can change
  2. 4. rate a rate in which the second quantity in the comparison is one rate
  3. 7. a quadrilateral with at least one pair of parallel
  4. 11. The largest common factor of two or more given numbers
  5. 13. A set of information collected about people or things, often to draw conclusions about them
  6. 14. a number that is multiplied by another number to get a product
  7. 15. The sum of the items in a set of data divided by the number of items in the set also called average
  8. 18. the x and y axis divide the coordinate plane into four regions. Each region is called a quadrant
  9. 19. one of two numbers whose product is one
  10. 20. The middle number or the mean of the two middle numbers in an ordered set of data
Down
  1. 1. area The sum of the areas of the faces,or surfaces, of a three dimensional figure
  2. 3. The least common multiple of two or more denominators
  3. 5. An element of the set of whole numbers and their opposites
  4. 6. The number of cubic units needed to fill a given space
  5. 8. A mathematical sentence that shows the relationship between quantities that are not equal
  6. 9. A quadrilateral with two pairs of parallel sides
  7. 10. The number or numbers that occur most frequently in a set of data when all numbers occur with the same frequency, we say there is no mode
  8. 12. A number that is a factor of two or more numbers
  9. 16. A graph that uses vertical or horizontal bars to display data
  10. 17. A value much greater or much less than the others in a data set