Biology, 20.04.2020 12:04 nicole10perez

HELP ASAP PLZ EARTH SPACE SCIENCE
1. An element has a half-life of 30 years. If 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain?

2. A 2.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of the radioactive element is 28 years. How much of this element will remain after 112 years?

3. An element has a half-life of 29 hours. If 100 mg of the element decays over a period of 58 hours, how many mg of the element will remain?

Need help asap plz !!

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HELP ASAP PLZ EARTH SPACE SCIENCE
1. An element has a half-life of 30 years. If 1.0 mg of this...