Algebra terms

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Across
  1. 5. the distance around a boundary.
  2. 8. a set of lines going opposite directions infinitely.
  3. 10. the number in the middle
  4. 11. identifying the size of an object or distance from one point to the other.
  5. 13. ____ is the measure of a region's size on a surface.
  6. 15. a relation between a set of inputs having one output each.
  7. 17. ____ are ordered pairs of points that help locate any point.
  8. 18. the alphabetic character that expresses a numerical value or a number.
  9. 19. a value, which on multiplication by itself, gives the original number.
Down
  1. 1. a measure of its steepness.
  2. 2. the most common number that appears in your set of data.
  3. 3. the average of a data set
  4. 4. the ratio of the circumference of a circle to its diameter.
  5. 6. The point where the line or curve crosses the axis of the graph.
  6. 7. a comparison between two quantities with different units.
  7. 9. a set of numbers that contain operations and can contain a variable.
  8. 11. equation equation that may be put in the form where are the variables.
  9. 12. a pictorial representation of numbers on a straight line.
  10. 14. a number or ratio that can be expressed as a fraction of 100.
  11. 16. an abstract idealization of an exact position.