# The weight of radioactive substance remaining after t years is given by W = 1000 20:04t

**Chapter 4, Problem 11**

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The weight of radioactive substance remaining after t years is given by W = 1000 20:04t grams. a Sketch the graph of W against t. b Write a function for t in terms of W. c Hence find the time required for the weight to reach: i 20 grams ii 0:001 grams.

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