Question

1. choose the best answer.

a ______ is a value, usually in the form of a letter or symbol, that can change or that represents an unknown quantity.
○ variable
○ constant
○ vector
○ valuable

1. choose the best answer.

to perform all the indicated operations means to ______ an expression.
○ coefficient
○ simplify
○ output
○ variable

Explanation:

Question 1

A variable is defined as a value (often a letter/symbol) that can change or represent an unknown quantity. A constant has a fixed value, a vector has magnitude and direction, and "valuable" is not a mathematical term here. So the correct answer is "variable".

To perform all indicated operations on an expression (like combining like terms, simplifying operations) is to simplify it. "Coefficient" is a number with a variable, "output" is a result (not the action), and "variable" is a symbol, not an action. So the correct answer is "simplify".

Answer:

A. variable

Question 2