When adding numbers in scientific notation, we need to ensure that the exponents of 10 are the same.
2.98x10^7 + 3.12x10^7 can be rewritten as:
(2.98 + 3.12) x 10^7
= 6.10 x 10^7
Therefore, the sum of 2.98x10^7 and 3.12x10^7 in scientific notation is 6.10x10^7.