Respuesta :

Answer: 6.2 ⋅ 1024

(2.0×10^-4)×(3.1×10^-20)

=(2.0×3.1)×(10^4×10^-20)

=6.2×10^(-4+(-20))

=6.2×10^-24. Hope it help!

Answer 6.2.1024 hope that helps