Ellie's amazing crossword

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Across
  1. 4. how many x-intercepts are in the following quadratic equations: 2x^2+x+78
  2. 6. tool used for calculations
  3. 9. Venomous snake with a rattling tail
  4. 10. Opposite of subtraction
  5. 13. you catch the ball from the opposing team in football
  6. 14. like a rat but smaller and cuter
  7. 15. Number times a Number
  8. 16. best dc superhero that rules the night
  9. 17. the number attached the the variable
  10. 18. green button on the calculator
  11. 19. the m in algebra
Down
  1. 1. 90 degree angle (2 words)
  2. 2. really pretty plants with petals and a bulb
  3. 3. The maximum or minimum number of the axis of symmetry
  4. 5. modeled by the equation y=a(r-1)^x (2 words)
  5. 6. Name the following polynomial, 2x^3+9x-4 (2 words)
  6. 7. tell time and also tics
  7. 8. being not nice
  8. 11. Length times Width
  9. 12. please excuse my dear aunt sally