For b the answer is 2.726x10^-2
So u move the decimal between the first and second number. And then for the exponent of 10, it’s -2 because to get from ur answer number (2.726) to the original number (0.02726) you’ll have to divide by 100 (=10^2). And dividing by 10^2 = x10^-2 (basically when u divide by 10^n = x10^-n)
Therefore the answer is 2.736x10^-2
Hope u understand what I’m saying, sorry if my explanation doesn’t rlly make sense