Algebra Final puzzle

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Across
  1. 7. making something simple
  2. 9. a nomial, but there is only one
  3. 11. arguably the most important kind of math
  4. 13. two lines that do meet at a 90 degree angle
  5. 15. a nomial, but there are many of them
  6. 16. order of numbers or problems
  7. 17. a synonym of representing or filling in for someone or something
  8. 19. a nomial, but there are two
  9. 20. when something is smooth or a number is 2 or 4 it is ____
Down
  1. 1. the problem for multiplying two binomials or what is used to cover food
  2. 2. a nomial, but there are three
  3. 3. x=-b+or- you get the idea
  4. 4. two lines that never intersect no matter how close they get to each other
  5. 5. maximum or highest point
  6. 6. unit of measurement for angles
  7. 8. what is done on a graph
  8. 10. something strange or for a math example, 5
  9. 12. something that is not similar when compared
  10. 14. arranged in a straight line
  11. 18. also known as numbers on a list