Math crossword puzzle

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Across
  1. 6. a fixed numerical value
  2. 8. an expression in which the highest power of the variable is 2
  3. 9. a number that is multiplication by a variable in an expression
  4. 11. the reverse of factorization
Down
  1. 1. an expression in which the highest power of the variable is always 1
  2. 2. a method of writing numbers as the product of their factors or divisors
  3. 3. are that have the same variables and powers
  4. 4. a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division
  5. 5. a symbol that doesn't have a fixed value
  6. 7. are those terms whose variables and their exponents are different from each other
  7. 10. can be a single constant, a single variable, or a combination of a variable and a constant combined with multiplication or division