Question: needing help with these two Question 9 A sample of a newly discovered element, West Virginiam, has been discovered. A 432 mg sample has decayed

needing help with these two

Question 9 A sample of a newly discovered element, West Virginiam, has been discovered. A 432 mg sample has decayed to 125.28 mg in only 19 years. 8 points What is the half-life of West Virginiam? Number years (round to one decimal place)Question 11 An investment of $8,200 is made in an account compounded weekly at 5.9%. How much will the investment be worth in 12 years? 8 points $ Number (round to the nearest cent)

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