Question

What is 0.00000000472 estimated as the product of a single digit and a power of 10?

Answer 1

`0\underbrace{.000000004}_(9\to)72=4.72\cdot10^(-9)`

Answer 2

The power of 10 is equal to the numbers of 0;

`10^(-9) *472 = 4.72*10^(-11)` ≈
`5* 10^(-11)`

Final answer:
`5* 10^(-11)`