rubyromero428 rubyromero428 15-04-2021 Mathematics contestada PLZ HELP Which is the sum of 3.15 × 10^7 +9.3 × 10^6 ? Write your answer in scientific notation. A. 4.08 × 10^7 B. 4.08 × 10^6 C. 0.408 × 10^8 D. 40.8 × 10^6