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Across 3. an equation with a < or > sign 4. the opposite of a number or inverse, a/b and b/a 5. when v + m = v + m 15. a statement that can be written in if-then form 16. when (a + c) +b = (b + a ) + c 20. an expression with x to the n 21. positive and negative numbers, including 0 24. an increase of decresed is expressed as a percent 25. when a + b + c = b + a + c 26. the set of elements from the replacement set that make an open sentence true

Down 1. an equation that states a rule for certain quantities 2. two numbers whose product is 1 3. a number than cannot be expressed as a over b 4. a comparison of two numbers by division 6. two terms with the same variable and/or exponent 7. the rules you follow to solve a mathematical sentence 8. two equations that have the same solution 9. using facts, properties and rules to reach a valid conclusion 10. the number a base is raised to 11. a symbol for a number or an object 12. a number that can be expressed as a over b, a/b, a terminating or repeating decimal 13. when a number on the outside of parentheses is given to each term in the parentheses 14. the study of numbers and the relationships between them 17. two numbers with a sum of 0, a + (-a) 18. a mathematical sentence with one or more variables 19. an example that proves the conclusion false 22. an equation stating that two rations are equal 23. the numbers in a multiplication problem