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A) True
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In an experiment that has the purpose of testing the efficacy of a procedure or drug, comparison is made against the efficacy of a placebo, a procedure or drug that is <em>intended to have no effect whatever</em>.
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Famously, a placebo is often found to be nearly as effective (or even more effective) than the procedure or drug on trial. This effect is known as "the placebo effect."
Answer:
Neither, x can be a negative number as well. If there is context, please post more to the question.
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4 laps
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Isaac ran 4 laps.
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Hope this helps
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