Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5 × 10^9 years. The half-life of Uranium-233 is 1.6×10^5 years. He computed how much greater the half-life of Uranium-238 is than that of Uranium-233, and his calculator displayed the number 2.81E4. What is this number in scientific notation?
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The number 2.81E4 written in scientific notation is 2.81 × 10^4.
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