Question

it is estimated that there are 7,500,000,000,000,000,000 grains of sand in beaches of the world. how is this written in scientific notation

Answer 1

7.5 x 10¹⁹

Explanation:

I took the test.

Answer 2

7.5 * 10^18

Explanation:

We know, as a general fact, scientific notation is written with a decimal multiplied by a power of ten. There are 17 zeroes after the 5, so that makes it 75 * 10^17. However, scientfic notation has a decimal. To get to a decimal, we need to move one place to the left. So add 1 to 17 for 7.5 * 10^18.