For this case we must find an expression equivalent to:
![4,325,000,000](https://tex.z-dn.net/?f=4%2C325%2C000%2C000)
To express in scientific notation we must take into account that the power will be positive, that is, the decimal is run to the right.
We test each option.
Option A:
![4,325 * 10^{-9}](https://tex.z-dn.net/?f=4%2C325%20%2A%2010%5E%7B-9%7D)
If we run the decimal 9 spaces to the left we have:
![0.000000004325](https://tex.z-dn.net/?f=0.000000004325)
Option B:
We discard it because the exponent is negative.
Option C:
![4,325 * 10 ^ 6](https://tex.z-dn.net/?f=4%2C325%20%2A%2010%20%5E%206)
We run the decimal 6 spaces to the right
![4,325,000](https://tex.z-dn.net/?f=4%2C325%2C000)
Option D:
![4,325 * 10 ^ 9](https://tex.z-dn.net/?f=4%2C325%20%2A%2010%20%5E%209)
We run the decimal 9 spaces to the right
![4,325,000,000](https://tex.z-dn.net/?f=4%2C325%2C000%2C000)
Answer:
Option D
I believe your answer is D. y = x/9.
The sum of the digits is 81
sum the digits again and get 9
Therefore, as 9 is only divisible by 9 and 3 the answer is 'C'
It is true. Hope it help!