A source of ¹⁸F (t_1/2 = approximately 2 hr) is noted to contain 3 mCi at noon.What was the radioactivity at 8:00 AM that same day?

Name: A source of 18 F (t 1/2 = approximately 2 hr) is noted to contain 3 mCi at noon.What was the radioactivity at 8:00 AM that same day?
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The radioactive decay law can be algebraically rearranged (dividing both sides of the decay equation by A₀) as: A/A₀ = e^-^0.693F1F1F1S1^F1F1F10F1F1F1S1^F1F1F10⁽^t/t_1/2⁾.

A Source of 18F (T1/2 = Approximately 2 Hr) Is

A Source of ¹⁸F (T_1/2 = Approximately 2 Hr) Is