Algebra - basics

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Across
  1. 2. A polynomial whose highest power is three (5)
  2. 7. A rule or fact written with mathematical symbols (7)
  3. 9. An expression where the highest power of the variable is 1 (6)
  4. 10. A combination of terms (10)
  5. 11. Anything containing an equals sign (8)
Down
  1. 1. A single number or a variable (4)
  2. 3. A number used to multiply a variable (11)
  3. 4. A symbol for a value we don't know yet (8)
  4. 5. A term with a value that never changes (8)
  5. 6. A polynomial with a squared term as its highest power (9)
  6. 8. Using letters or other symbols to represent numbers (7)