algebra terms

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Across
  1. 8. what function combined two numbers to create a new whole
  2. 10. a^2+b^2=c^2
  3. 12. a value that is either stated as a number or as a letter
  4. 14. a combination of lines that come together to form a _____
  5. 16. a way of representing either really large or really small numbers
  6. 17. a line horizontal on a coordinate plane
  7. 18. a curved line that separates an equation
Down
  1. 1. most commonly expressed as a letter
  2. 2. the process of taking two numbers and finding the difference of the two numbers
  3. 3. a vertical line on a coordinate plane
  4. 4. a value that will not change no matter the circumstances. also known as a number
  5. 5. a smaller number attached to another term that multiplies that term with itself
  6. 6. a part of a line that terminates
  7. 7. a way to visualize a set of coordinates
  8. 9. the process of getting the starting constant of a number squared
  9. 10. please excuse my dear aunt sally
  10. 11. a way to create a larger number quickly
  11. 13. a series of terms and operations
  12. 15. the opposite of multiplication
  13. 18. a mathematical constant. is irrational