Please solve a) and b) correctly
An unknown radioactive element decays into non-radioactive substances. In 
days the radioactivity of a sample decreases by 
percent.
(a) What is the half-life of the element?
half-life:____________ (days)
(b) How long will it take for a sample of 
mg to decay to 
mg?
time needed:___________ (days)
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please help with parts in case 1 and case 2! thanks you!
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