Mathematics

2. A statement that is true for any numbers
5. A symbol that represents an unknown quantity
7. The property that states that the order in which numbers are added or multiplied does not change their sum or product
8. A flat surface
9. The property that states that the way in which numbers are grouped when they are added or multiplied does not change their sum or product
10. where three or more planes intersect at a point

1. A term without a variable
2. Lines that will never intersect
3. A sentence stating that two quantities are equal
4. When addition or subtraction signs separate an algebraic expression into parts
6. The branch of mathematics that involves expressions with variables
7. The numerical factor of a multiplication expression that contains a variable
11. Where two planes intersect in a line