84000000/4 x 10^12
84⋅1064⋅1012=21⋅1018
84⋅1064⋅1012=21⋅10−6=0.000 021
What is correct? Please use brackets.
!
Many of us on the forum (I think including YOU) had this discussion a few months ago and decided this representation was rather ambiguous, but most agreed it is
[(8.4 x 10^7)/4] x 10^12 so your first solution is the one considered correct by most of us and most calculators too...... use brackets to be clear !!!