Question

(PICTURE ATTACHED) please help

Answer 1

A

Explanation:

9,460,528,400,000,000 can be rounded off to

9,000,000,000,000,000.

A trick you can use for these questions is count the number of zeroes at the end.

There are 15 zeroes, hence the answer is

`9 * 1 {0}^(15)`

Proof:

`1 {0}^(2) = 100`

`1 {0}^(3) = 1000`

Hence, the number of zeroes is equal to the exponent.