Sorry, no online dictionaries contain the exact phrase an unknown or changeable quantity.

Reverse dictionary results:
1. uncertainty
2. coefficient
3. quadratic
4. eliminate
5. root
6. roots
7. some
8. biquadratic
9. elimination
10. null
11. least squares
12. rule of three
13. quadratic equation
14. uncertain
15. constant
16. fluid
17. tickling
18. various
19. extrapolate
20. indeterminate
21. variable
22. variant
23. set
24. vicissitude
25. yardland
26. shot
27. baz
28. drug
29. tune
30. unsteadiness
31. bar
32. barred
33. bars
34. blip
35. open
36. var
37. twist
38. choppy
39. deform
40. distortion

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You can look up the words in the phrase individually using these links:   an ?   unknown ?   or ?   changeable ?   quantity ?
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