What is the use of three terminal plugs like of refrigerators

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough

An observation that requires measurement is called quantitative observable or qualitative