Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5 x 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?
(1 point)
O 4 × 10^(2.81)
O 2.81 × 10^(-4)
O 2.81 + 10^(4)
O 2.81 × 10^(4)