Math puzzle

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Across
  1. 3. an equality of ratios.
  2. 4. Terms that are combined by using mathematical operations
  3. 7. A fixed numerical value
  4. 9. a method of writing numbers as the product of their factors or divisors
  5. 10. expression an expression in which the highest power of the variable is 2
  6. 11. terms Terms that have the same variable and power
  7. 13. A number that is multiplied by a variable in an expression
  8. 14. of proportionality. The Constant value of the ratio between two proportional quantities
  9. 16. Can be a single Constant or variable, or a combination of variable and Constant
Down
  1. 1. Relation between two quantities of the same kind.
  2. 2. proportion. If one quantity increases the other decrease or vice versa
  3. 4. the reverse of factorization
  4. 5. terms Terms whose variables and exponent are different
  5. 6. Proportion. If one quantity increases the other increases too
  6. 8. A symbol that doesn't have a fixed value
  7. 12. expression an expression in which the highest power is 1
  8. 15. A ratio that compares two quantities with different units.