Final answer:
To find the sum of the numbers in scientific notation, add the coefficients and keep the same base and exponent. The correct answer is 8.49 x 10^10.
Step-by-step explanation:
To find the sum of the numbers in scientific notation, we need to add the coefficients and keep the same base and exponent. Therefore, (2.04 x 10^6) + (6.45 x 10^10) would be:
(2.04 + 6.45) x 10^10 = 8.49 x 10^10
So the correct answer is B. 8.49 x 10^10.