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Hello, could you please help me with this answer. Thank you! The radioactivity of an element decreases by 67 percent in 320 days. (a) Determine

Hello, could you please help me with this answer. Thank you!

The radioactivity of an element decreases by 67 percent in 320 days. (a) Determine the half-life of the element, rounded to a whole number: (b) Determine the number of days, rounded to a whole number, for a sample of 100 mg to decay to 54 mg

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