Use the Exponential Decay Formula with Half-Lives to Find the Final

Multiple Choice

Use the exponential decay formula with half-lives to find the final amount. Round to the nearest tenth when necessary.
- $\begin{array}{c|c|c|c}\text { Original } & \text { Half-Life } \\\text { Amount } & \text { (in years) } & \begin{array}{c}\text { Number } \\\text { of Years }\end{array} & \begin{array}{c}\text { Final Amount after } \\\text { x Time Intervals }\end{array} \\\hline 400 & 8 & 52 &\end{array}$

A) $4.4$
B) $1.6$
C) $425.7$
D) $359.5$