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What is n+15n + 15 called, and what three kinds of parts can be combined to form it?

Question: What is n+15n + 15 called, and what three kinds of parts can be combined to form it?

Sample answer: It is an expression. The three parts are numbers, variables, and operation symbols.

Key points:

  • n+15n + 15 is an expression.
  • Numbers are one part (for example, 1515).
  • Variables are another part (for example, nn).
  • Operation symbols are the third part (for example, ++).

Rubric: Full credit: names it an 'expression' and lists all three parts (numbers, variables, operation symbols). Partial credit: correct name or a partial list. No credit: wrong name and no correct parts.

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Updated 2026-07-19

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