Certain radioactive material decays in such a way that the mass remaining after $\displaystyle {t}$ years is given by the function
$\displaystyle {m}{\left({t}\right)}={200}{e}^{{-{0.045}{t}}}$
where $\displaystyle {m}{\left({t}\right)}$ is measured in grams.
(a) Find the mass at time $\displaystyle {t}={0}$.
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(b) How much of the mass remains after 15 years?
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Round answers to 1 decimal place.