Final answer:
A set of arithmetic operations, terms with the same variables and exponents, parts of an expression separated by a plus or minus, letters that represent numbers, numbers multiplied by variables, and numbers by themselves are key vocabulary terms in mathematics.
Step-by-step explanation:
A. A set of arithmetic operations: This refers to a collection of mathematical operations such as addition, subtraction, multiplication, and division.
B. Like terms: These are terms in an expression that have the same variables raised to the same exponents. For example, 2x and 3x are like terms.
C. Terms: These are parts of an expression that are separated by a plus (+) or minus (-) sign. For example, in the expression 5x + 3, the terms are 5x and 3.
D. Variable: A variable is a letter or symbol that represents an unknown value or quantity. It takes the place of a number in mathematical expressions or equations.
E. Coefficient: A coefficient is a number that is multiplied by a variable. In the expression 4x, the coefficient is 4.
F. Constant: A constant is a number by itself, and it does not change. For example, in the expression 2x + 3, the constant is 3.