math stuff

5. indicate a particular collection of numbers and meaningful operations are grouped together and considered one number
9. the relation between two expressions that are not equal
10. part of an expression
11. related to the sum of angles that can be arranged together so they form a straight line
13. a number sentence that is equal to another but written differently
16. either of two angles whose sum is 180 degrees
17. two lines intersecting at any point on a graph
18. sharing a common vertex and side
19. a single number/variable or numbers multiplied together

1. either of two angles whose sum is 90 degrees
2. a statement that the values of two mathematical expressions are equal
3. number sentence
4. describes the sum of angles that can be arranged together so they form a full turn
6. mathematical equation made up of numbers and symbols
7. an angle of 180 degrees
8. terms whose variables with any exponents are the same
12. each of the pairs of opposite angles made by two intersecting lines
14. the set of all the solutions of an equation or condition
15. an unknown numeric value