Assume that the universal set is Z. Consider the following sentence: (3t = Z) (t •x = 20). (a) Explain why this sentence is an open sentence and not a statement. (b) If 5 is substituted for x, is the resulting sentence a statement? If it is a statement, is the statement true or false? (c) If 8 is substituted for x, is the resulting sentence a statement? If it is a statement, is the statement true or false? (d) If -2 is substituted for x, is the resulting sentence a statement? If it is a statement, is the statement true or false?

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