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.
- $\begin{array}{c|c|c|c}\begin{array}{c}\text { Original } \\\text { Amount }\end{array} & \begin{array}{c}\text { Half-Life } \\\text { (in years) }\end{array} & \begin{array}{c}\text { Number } \\\text { of Years }\end{array} & \begin{array}{c}\text { Final Amount after } \\\text { x Time Intervals }\end{array} \\\hline 60 & 6 & 12 &\end{array}$

A) $0.9$
B) 15
C) $42.4$
D) 135