The Possible Impossible Crossword

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Across
  1. 3. WHERE THE X-COORDINATE DOESNT REPEAT
  2. 4. A 3D SHAPE OFTEN LIKE A BALL
  3. 6. HOW STEEP A LINE IS
  4. 8. WHERE THE LINE ON A GRAPH CROSSES THE Y AXIS
  5. 13. TRANSFORMATION THAT IS ADD AND SUBTRACT
  6. 14. LAST NAME OF BEST TIC TAC TOE PLAYER
  7. 15. TRANSFORMATION THAT ALWAYS MEANS MULTIPLY
  8. 16. WHEN A SHAPE FLIPS OVER AN AXIS
  9. 18. WHEN SHAPES ARE THE SAME BUT DIFFERENT SIZE
  10. 19. WHAT YOU SOLVE FOR IN AN EQUATION
  11. 20. WHEN YOU TURN A SHAPE ON A GRAPH
  12. 21. THEOREM THAT FINDS THE SIDE OF A TRIANGLE
Down
  1. 1. BEST COLLEGE BASKETBALL SCHOOL
  2. 2. HOW MUCH SOMETHING CAN HOLD
  3. 5. OPPOSITE OF IRRATIONAL
  4. 7. THE AMOUNT OF MONEY YOU DEPOSIT
  5. 9. MONEY ADDED OR SUBTRACTED OVER TIME
  6. 10. ONE-THIRD THE SIZE OF A CYLINDER
  7. 11. HOW MUCH SPACE SOMETHING TAKE UP
  8. 12. HOW LIKELY SOMETHING IS TO HAPPEN
  9. 17. 3D SHAPE WITH 2 CIRCLES AS THE BASES