Absolutely bonkers algebra crossword

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Across
  1. 1. A letter that can be used to mean different numbers at different times
  2. 3. A transformation in which a figure is enlarged or reduced with respect to a point called the center of dilation
  3. 4. The average of a collection of data values. This can be computed by adding all the values and then dividing by the number of values.
  4. 6. Rigid motion by a constant distance in a single direction, with no rotation or reflection.
  5. 7. Any function with the parent function f(x)=x^2
  6. 8. The distance a number is away from 0
  7. 11. A transformation in which a figure is turned clockwise or counter-clockwise around a given point
  8. 13. Expressions that have the same value
  9. 15. Terms whose variables and exponent power are the same
  10. 16. A number which when multiplied by itself, gives the number
  11. 18. The change in output divided by the change in input
  12. 19. The most common value in a collection, or “modes” if more than one are tied.
Down
  1. 2. a sequence of terms described by stating the start value and the operation that is performed to get to the next term in the sequence
  2. 5. Functions that, when graphed, do not form a line
  3. 9. The point where a parabola crosses its axis of symmetry, or an end of a side of a polygon, or the corner point of an angle.
  4. 10. A figure before transformations are applied
  5. 12. A transformation in which a figure is flipped to create a mirror or congruent image
  6. 14. The most common value in a collection, or “modes” if more than one are tied.
  7. 16. form Linear equation written in the form y=mx+b
  8. 17. The most basic graphs of each non-linear function