Pre-calc Radioactive decay?

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The half life of radioactive uranium II (^234 U) is about 250,000 years. What percent of a present amount of radioactive Uranium II will remain after 5,000 years?
 
Use the half-life formula a = x(0.5)^(t/h), where a is the future amount, x is the original amount, t is the time in years, and h is the half-life in years. Since you are finding a percent, let x = 100. The half-life h = 250,000 years and the time t = 5,000 years.

a = x(0.5)^(t/h) = 100(0.5)^(5000/250000) = about 98.62

ANSWER: about 98.62%
 
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