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Problem 12: (Recognizing Statements And Open Sentences)

Classify each sentence below as a statement, an open sentence, or neither. Make sure you justify each answer.

  1. Every integer is either even or odd.
  2. Today is Thursday.
  3. $x^2-9=0.$
  4. The second coming will occur in 2020.
  5. Sunsets are beautiful.
  6. Have you read the first book in the Harry Potter series?
  7. $\cos^2(x)+\sin^2(x)=1$.
Write your solution on a single page that you would be willing to put under a projector and share with the class. Make sure you give a justification for each answer you gave.

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