math skill puzzle

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Across
  1. 3. is a finite combination of symbols that is well-formed according to rules that depend on the context. Symbols can designate numbers (constants), variables, operations, functions, and other mathematical symbols, as well as punctuation
  2. 6. Not consisting or having fixed patterns; liable to change
  3. 7. The space inside a shape
  4. 8. Difference in size, degree, circumstances, etc.; lack of equality.
  5. 10. amount of space a object takes up
Down
  1. 1. The part of mathematics in which letters and other symbols are used to represent numbers and quantities in formulae and equations
  2. 2. The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids,
  3. 4. A probable event: "revolution was a strong probability
  4. 5. A statement that the values of two mathematical expressions are equal (indicated by the sign =).
  5. 9. The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.