Question

which statements are true about the expression ( z + 7 )? choose all that apply. the letter ( z ) is a variable. the number 7 is a variable. the letter ( z ) is a constant. the number 7 is a constant. the letter ( z ) is a term. the number 7 is a term.

Explanation:

• A variable is a symbol that represents an unknown or changing quantity, so $x$ is a variable.
• A constant is a fixed value that does not change, so 7 is a constant.
• A term is a single part of an expression, separated by addition/subtraction; both $x$ and 7 are individual terms in $x+7$.

Answer:

• The letter $x$ is a variable.
• The number 7 is a constant.
• The letter $x$ is a term.
• The number 7 is a term.