Answer: Option 1: 6.25 x 10²
Explanation:
For scientific notation, the exponent on 10 is how many decimal places you move; if the exponent is negative, the decimal moves to the left (or the number becomes smaller), and if the exponent is positive, the decimal moves to the right (or the number becomes larger).
625 is larger than 6.25, so the decimal moves to the right, indicating a positive exponent, eliminating options 2 and 4.
To go from 6.25 to 625, the decimal moves to the right 2 places, so the exponent is 2, which makes option 1 the correct answer.
I hope this helps! :)