Answer: 2.55 x 10⁷
Step-by-step explanation: Remember that the base number, or the number being multiplied by 10 to the nth power, needs to be less than 10 and greater than 1. To reduce this, you'd need to take away as many digits as you can until you get to a number that fits. For this, you'd take away the zeros, which would leave you with 255. Since that's still too large, you could reduce that to 2.55 (*you can only get rid of zeros, not any other number). Once you've done that, you can just count how many place values you had to go backward for you exponent. Hope this helps!