Question

What is (3.1x10^5)(2.2x10^7) in scientific notation?

Answer 1

It's B.) 6.82 x 10^12

Answer 2

The scientific notation:

`a\cdot 10^k` where
`1\leq a < 10` and
`k\in\mathbb{Z}`

`(3.1\cdot10^5)(2.2\cdot10^7)=(3.1)(2.2)(10^5\cdot10^7)\\\\=6.82\cdot10^(5+7)=6.82\cdot10^(12)`