Which of these sentences are propositions? What are the truth values of those that are propositions?

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Which of these sentences are propositions? What are the truth values of those that are propositions?

a) Boston is the capital of Massachusetts.
b) Miami is the capital of Florida.
c) 2 + 3 = 5.
d) 5 + 7 = 10.
e) x + 2 = 11.
f ) Answer this question.
g) Do not pass go.
h) What time is it?
i) There are no black flies in Maine.
j) The moon is made of green cheese.

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Propositions are a, b, c, d ,i and j. The truth values of the following are T ,F ,T ,F ,F ,F respectively.

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e,f,g,h are not propositions because e)without the value of x we can't say it is true or not (or)it is a predicate function and predicate functions are not propositions. f)it is not a declarative sentence. (its command sentence) g)it is not a declarative sentence. (its command sentence) h)it is not a declarative sentence.(it's interrogative sentence)