To determine which of the expressions results in the answer of 1, let's evaluate each option provided:
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13 - (7.42): \[ 13 - 7.42 = 5.58 \] (Not equal to 1)
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0: \[ 0 = 0 \] (Not equal to 1)
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5 + 0: \[ 5 + 0 = 5 \] (Not equal to 1)
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9 + 0: \[ 9 + 0 = 9 \] (Not equal to 1)
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(-2.97 + 0): \[ -2.97 + 0 = -2.97 \] (Not equal to 1)
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3 (8): \[ 3 \times 8 = 24 \] (Not equal to 1)
Given the options you've provided, none of them evaluate to 1. If there's more context or additional options, please provide that for further evaluation.