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2. a combination of numbers, variables, operators (+, -, ×, ÷, etc.), and functions (like sin, cos, etc.) that can be evaluated to a single value
5. a symbol, typically a letter, that represents a number whose value is not yet known or can change
8. represents a part of a whole
10. a system of equations where there is exactly one set of values for the variables that satisfies all the equations simultaneously
11. a real number that cannot be expressed as a ratio of two integers
13. any number that can be expressed as a fraction, specifically as a ratio of two integers, where the denominator is not zero
14. a statement that compares two values or expressions and indicates that they are not equal
15. something that isn't a straight line or that doesn't follow a simple, proportional relationship

1. a decimal number where a digit or a sequence of digits repeats infinitely after a certain point
3. the horizontal line on a graph, running left to right, that forms the base of the coordinate plane
4. a decimal number that has a finite number of digits after the decimal point, meaning it ends or stops rather than continuing infinitely
6. something that can be described by a straight line
7. the vertical number line on a coordinate plane
9. an equation or system of equations has no values for the variables that make the equation true
12. a statement that two expressions are equal, connected by an equals sign (=)