Determine which of the following is proposition. Indicate the reason why or why not.
1. The Earth is the second planet from the sun.
2. Buy a new book for your Algebra class.
3. 3x + 6 = 9 if and only if x = 1.
4. The platypus is a marsupial.
5. Are you in school today?
6. If x > 4 then x = 2.
7. 5 + 7 = 14.
8. Phil and James are brothers.
9. Hello, mother!
10. x^2 − 4x + 4
11. The University of Sto. Tomas is the oldest school in Philippines.
12. If the teacher is absent, then the students will celebrate.
13. The new faculty loves to wear jeans.
14. Every equilateral triangle is equiangular.
15. I love you.
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