Question

which of the following measurement is more accurate
a)40
b)0.04
3)400×10^-4
4)4×10^1

Answer 1

b)0.04 is the measurement with more precision

Answer 2

well, I can't understand actually what do you mean by accurate measurement, but see option a) and option b). They are 40 and 0.04 respectively. Now, look option 3) and 4). If we simply option 3) we get 0.04 only, and if simply option 4) we get 40.
These are my views.