Choose the best answer for each of the questions below.
What is a variable?
A symbol that represents a value, which is unknown or arbitrary.
A term that does not contain numbers.
A non-numerical symbol.
A letter of the alphabet.
What is a constant term?
The numerical factor of a term.
A term that does not contain variables.
The numerical power of a term.
Which of the following best describes an algebraic expression?
Consider the following statement:
'By the commutative property, we can rewrite $x-4$x−4 as $4-x$4−x.'