Math words puzzle

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Across
  1. 3. The area under a curve.
  2. 5. An expression with variables and coefficients.
  3. 7. A statement that two expressions are equal, typically containing an equals sign.
  4. 9. A branch of math using symbols to represent numbers in formulas.
  5. 11. A statement proven based on previously established statements.
  6. 12. The rate at which a function changes.
  7. 13. A relationship where each input has a single output.
  8. 15. A step-by-step procedure for calculations.
  9. 16. A number indicating how many times to multiply a base by itself.
  10. 17. A closed plane figure with straight sides.
  11. 18. A rectangular array of numbers or symbols.
Down
  1. 1. A quantity having both magnitude and direction.
  2. 2. A symbol like (x) or (y) representing an unknown or changing value.
  3. 4. The measure of how likely an event is to occur.
  4. 6. The study of shapes, sizes, and properties of space.
  5. 8. A number representing part of a whole, expressed as a fraction.
  6. 10. A whole number that can be positive, negative, or zero.
  7. 11. A straight line that touches a curve at a single point.
  8. 12. The distance across a circle through its center.
  9. 14. The mathematical study of continuous change.