The value of 3.6 has TWO significant figures.
There are two significant figures which are the two 2s.
22.1 to two significant figures = 22
Two of them.
23.81558 to two significant figures is 24.
42 has two significant figures.
687 to two significant figures is 690.
100 to two significant figures is 1.0e2
Two significant figures.
Two significant figures.
It has two significant figures.
43 has two significant figures.