Final answer:
The vocabulary word for the use of numbers, variables, and operation symbols in mathematics is algebra.
Step-by-step explanation:
The vocabulary word for the use of numbers, variables, and operation symbols in mathematics is algebra. Algebra is a branch of mathematics that uses symbols and letters to represent numbers and quantities.
In algebra, numbers are represented by digits, variables are represented by letters, and operation symbols (such as +, -, ×, ÷) are used to perform calculations. By using algebraic expressions and equations, we can solve problems and find unknown quantities.
For example, in the equation 2x + 5 = 15, x is the variable, 2 is the coefficient, + is the operation symbol, and 5 and 15 are the numbers. By solving the equation, we can determine the value of x.