We are given 23 * 10^-8
The first number needs to be greater than 0 but less than 10. We can divide to make 23 follow that.
23 / 10 = 2.3
Since we divide once, we can subtract that to the power.
-8 - 1 = -9
Write the new notation:
2.3 * 10^-9
Best of Luck!