algebra ('-')

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Across
  1. 4. that was absolutely rad cal!!
  2. 5. gum gum man goes -------
  3. 7. lines intersecting with lines (;
  4. 8. I have no answer to that -----
  5. 10. krabby patty secret ------
  6. 11. we have a pop ---- today!!!
  7. 12. sudden and exp-----ial growth
  8. 14. subtraction but more complicated
  9. 15. addition but more complicated ....
Down
  1. 1. line
  2. 2. it depends
  3. 3. quad
  4. 6. R O U N D
  5. 9. i'm taking this away
  6. 13. how about a little more