Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5 × 10° years The half-life of Uranium-233 is 1.6 x 10 years. He computed how much greater the half-life of Uranium-238 is than that of Uranium-233, and his calculator displayed the number 2.814. What is this number in scientific notation? (1 point)
2.81 + 10^4
4 × 10^2.81
2.81 x 10^4
2.81 × 10^-4