Question

Multiply (1.9 × 10^7)(3 × 10^6). Express the result in scientific notation.

5.7 × 10^13

5.7 × 10^12

5.7 × 10^42

5.7 × 10^43

Answer 1

`(1.9\cdot10^7)(3\cdot10^6)=(1.9\cdot3)(10^7\cdot10^6)=5.7\cdot10^(7+6)\\\\=\boxed{5.7\cdot10^(13)}\\\\Used:\ a^n\cdot a^m=a^(n+m)`