Number Puzzle

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Across
  1. 4. standard form of y= -2x²+6x+x³-20
  2. 6. y-intercept of y=(x+2)(x-3)(x+1)
  3. 8. 1/2(186°-70°)
  4. 9. 1/2(100°+120°)
  5. 12. 2x-5x+13/x+2
  6. 17. roots of x³+9x²+23x+15=0
  7. 20. x-intercept of y=(x+2)(x-3)(x+1)
  8. 21. 1/2(250°-110°)
  9. 22. roots of x³+9x²+23x+15=0
  10. 23. 1/2(140°-30°)
  11. 24. An=-5+(103-1)-4
  12. 26. 1/2(170°)
  13. 27. roots of x³-2x²-x+2=0
  14. 29. An=25=(19-1)-2
  15. 30. A8=n²-9
  16. 31. Geometric sum of 5 terms in the sequence 1/2,2/3,8/9
  17. 33. An=26+(40-1)-4
  18. 34. 5x²-17x-15/x-4
  19. 35. center of x²+y²-6x-10y+18=0
  20. 37. area of sector=60°/360° x 100πcm²
Down
  1. 1. equation of a circle with center at origin and r=15 units
  2. 2. general equation of (x-4)²+(x-[-1])²=7²
  3. 3. half of a circle
  4. 5. 1,4,9,16,?
  5. 7. y-intercept of y=x²+3x=2
  6. 8. A8= n²-n/3
  7. 10. 11th term in the fibonacci sequence starting with 0,1,1
  8. 11. x-intercept of y=x²+3x+2
  9. 13. roots of (x+5)⁵(x-3)³=0
  10. 14. A5=2(n+3)
  11. 15. roots of x(x-4)(x+5)(x-1)=0
  12. 16. roots of (x²+4)(x-3)⁴=0
  13. 18. Ymid=-8+6/2
  14. 19. roots of (x²-4x+4x)(x-5)³=0
  15. 21. area of segment=19.64cm²-12.5cm²
  16. 25. center of x²+y²+6x-10y+18=0
  17. 28. A5=1/64 / 1/2
  18. 32. An=3n²=2n=5
  19. 36. A2= 3+n/2
  20. 37. 1/2(186°-70°)