laneuensgrett laneuensgrett 03-02-2016 Mathematics contestada What is the sum of (1.3 × 10-7) and (-3.8 × 10-3)? A. 2.5 × 10-10 B. -2.5 × 10-4 C. 3.8 × 10-3 D. -3.8 × 10-3