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Unformatted text preview: solution in moles per liter. Find the hydrogen ion concentration if the pH = 8. 4) Find out how long it takes a $3200 investment to double if it is invested at 7% compounded quarterly. Round to the nearest tenth of a year. Use the formula A = P 1 + r n nt . 5) The function A = A e0.01386x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 600 pounds of the material are initially put into the vault, how many pounds will be left after 40 years? 6) A fossilized leaf contains 29% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the halflife of carbon 14. 1...
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 Spring '08
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 Math, Formulas

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