Simplifying and solving equations and inequalities

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Across
  1. 2. A closed plane figure formed by three or more line segments that do not cross
  2. 3. Paranthesis, Exponents, Multiplication or Division, Addition and Subtraction whichever is 1st(left to right)
  3. 4. The number that tells what power the base goes to
  4. 5. Like terms that have the exact variable or variable exponent
  5. 6. A whole number
  6. 9. A number multiplied by itself twice
  7. 12. Any Number with an exact value
  8. 13. A number times a variable
Down
  1. 1. The value of the ratio of quantities in a proportional relationship
  2. 3. Two numbers or integers when added together equals 0
  3. 7. Two or more letters written adjacently that indicates multiplication
  4. 8. A number multiplied by itself three times
  5. 10. A letter that represents a numerical value
  6. 11. The number of places a number is from zero