Diane Guiot Math crossword puzzle

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Across
  1. 2. the distance of a number from 0 on a number line, shown by | |
  2. 3. a letter or symbol used to represent a quantity that can change.
  3. 5. in statistics, the difference between the greatest and least values in a set of data
  4. 7. the x-axis and y-axis divide the coordinate plane into 4 regions. Each region is called a ________
  5. 8. an arrangement of two-dimensional figures that can be folded to form a solid figure
  6. 10. a bar graph whose bars represent the frequency of numeric data within equal intervals
  7. 14. two numbers are _________ if, on a number line, they are the same distance from 0 but on different sides
  8. 15. a number greater than 0
  9. 16. a number less than 0
  10. 17. a rate for one of something
  11. 19. the point where the x-axis and the y-axis intersect on a coordinate plane; (0,0)
  12. 20. the number of cubic units needed to fill a given space
Down
  1. 1. the middle number in a set of data or the average of the two middle numbers in a set of data
  2. 4. a question that has many different or variable answers
  3. 6. an expression that contains at least one variable
  4. 9. the number that is multiplied by the variable in an algebraic expression
  5. 11. the sum of the items in a set of data divided by the number of items in a set of data, also called average
  6. 12. a quadrilateral with two pairs of parallel sides
  7. 13. a value much greater or much less than the other numbers in a data set
  8. 18. a transformation of a figure that flips the figure across a line