The exponential decay has the standard form:
\(\displaystyle{y}={a}{\left({b}\right)}^{{x}}\), where 0

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The correct answer is D: \(\displaystyle{y}={3}{\left(\frac{{1}}{{2}}\right)}^{{x}}\)The correct answer is D: \(\displaystyle{y}={3}{\left(\frac{{1}}{{2}}\right)}^{{x}}\)