Question

Question #34e81

Answer 1

I hope it helps:

Explanation:

The good thing about scientific notation is that you do not need to deal with a lot of zeros and the operations are quite simplified. The problem is that you need to remember some rules of exponents!
In your case you have a multiplication that can be written as:
`(8.2*2.1)*(10^2*10^5)=`
here you take advantage of the fact that the order in the multiplication is irrelevant.

The first multiplication is easy to do while the second can be solved remembering that: `x^m*x^n=x^(m+n)`

so, basically, if the base is the same (`10`) you simply add the exponents:
`10^2*10^5=10^(2+5)=10^7`
your number then becomes:
`(8.2*2.1)*(10^2*10^5)=17.22*10^7` or `1.722*10^8`

Consider a division now and see, by yourself, what will be the result!