Math cross word puzzle

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Across
  1. 4. the process of substituting letters with their numerical value and simplifying
  2. 5. the resulting points or shape in a transformation
  3. 10. A mathematical sentence stating that two quantities are equal
  4. 11. a letter that represents an unknown value or number
  5. 12. triangle, a triangle that has one obtuse angle and two acute angles
  6. 13. the middle value in a ranked list of data
  7. 15. a line where two faces of a three dimensional solid meet
  8. 17. a number that shows how many times a base is used as a factor
  9. 18. figure, a shape formed from the combining of simple shapes
  10. 21. grid line, a numbered grid line
  11. 23. lines, lines that never intersect
  12. 25. the measure of a shapes surface
  13. 27. the value substituted into the equation
  14. 28. a solid shape that has a curved lateral surface and two circular bases with equal radii
  15. 29. the final rightmost digit of a data value
Down
  1. 1. numbers, all numbers less than zero
  2. 2. marks, marks used to show that two sides or angles are equal
  3. 3. a rule written using variables
  4. 6. title, a title on each axis that describes the measurement of that axis
  5. 7. variable, the variable that depends on other variables for its value
  6. 8. a flat side of a geometric solid
  7. 9. value, the distance of any number from zero
  8. 14. any collection of facts or information
  9. 16. slope, the slope of a horizontal line; the line has no change in y- values
  10. 18. all other outcomes besides those of the indicated event
  11. 19. event, an event composed of two or more separate events
  12. 20. a six sided polygon
  13. 22. a part of a circle
  14. 24. price, regular price of an item
  15. 26. formed by two rays that share a common endpoint