Which of the following expressions is written in scientific notation? a) 0.3 x 10^4 b) 2 x 10^-5 c) 10 x 10^3 d) 12 x 10^-3

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.