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1. the number that appears most often in a set of numbers.
2. the horizontal plane in a Cartesian coordinate system.
4. an equation or system of equations has no values for the variables that satisfy the equation(s) simultaneously.
5. the difference between the highest and lowest values.
7. something that forms a straight line when graphed or described by an equation where the highest power of a variable is 1.
9. number, any real number that cannot be expressed as the quotient of two integers—that is, p/q, where p and q are both integers.
11. A rational number is a number that is expressed as the ratio of two integers, where the denominator should not be equal to zero, whereas an irrational number
12. a variable is a symbol, typically a letter, that refers to an unspecified mathematical object.
13. A mean is a quantity representing the center of a collection of numbers and is intermediate to the extreme values of the set of numbers.

1. the middle value in a sorted list of numbers.
3. Every nonnegative real number x has a unique nonnegative square root, called the principal square root or simply the square root.
6. a number that divides another number evenly, leaving no remainder.
8. An expression in math is a statement having minimum of two numbers, or variables, or both and an operator connecting them.
10. In mathematics, a relation denotes some kind of relationship between two objects in a set, which may or may not hold.
14. a statement of equality between two expressions