Identify each as an expression, sentence, open sentence, equation, or inequality. Write A if it is "expression" only, B if "sentence, inequality", C if "sentence, equation", D if "sentence, open sentence, inequality", E if "sentence, open sentence, equation".
1. Negative nine decreased by 3 times a number
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2. Four times the sum of a number and -5 is 20
3. Fourteen subtracted from a number is less than 10