Scientific notation is always expressed as a number between 1 and 10 not including 10 followed by 10 to a power.
1 ≤ x < 10
7.6 * 10^2 is the correct answer. You used one of the powers to get to a number between 1 and 10
0.76 * 10 = 7.6 That leaves you with 2 tens.