B.y=500 et C.y=500 ex D.y = 1,000 2 E.y=600-10 4. The half-life of nickel-63 is 100 years. A students says, "An artifact with nickel-63 in it will lose a quarter of that substance in 50 years." Do you agree with this statement? Explain your reasoning. (From Unit 4, Lesson 7.) 5. Technology required. Estimate the value of each expression and record it. Then, use a calculator to find its value and record it. expression estimate calculator value log 123 log 110,000 lo

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