imium isotope ${?}^{109}Cd$ has a half$-$life of $462$ days. A sample with $1\mathrm{.}0{10}^{12109}Cd$ atoms.

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How many ${?}^{-4}$ Vid atoms are left in the sample atter $\frac{8}{?}$ days"?

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Part B

How many ${?}^{109}Cd$ atoms are left in the sample after $440$ days?

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Part C

How many ${?}^{109}Cd$ atoms are left in the sample after $5500$ davs?