which is the best estimate for (2.8 x 10^3)(4.1 x 10^6) written in scientific notation? A) 7 x 10^9 B) 1.2 x 10^6 C) 1.5 x 10^10D) 12 x 10^18

(2.8 x 10^3)(4.1 x 10^6)
= 2.8 x 4.1x 10^9
≈ 11.48 x 10^9
≈ 1.148 x 10^10
≈ 1.15 x 10^10

The closest answer will be C