Answer:
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.