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The half life of a radioactive element is 20 years. What percent of an initial amount of this element will remain after 40 years ? What is the nth derivative of sin^6(x)? Along with the steps pls*? Write a story about your ride in a car to school. Include the words speed, velocity, acceleration, and inertia, in your story? When potassium and sulfur react to produce an ionic compound, how many total electrons are transferred for each formula unit? How would you round .3899 to 3 places? What's the correct way? .381
.390
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