20
Step-by-step explanation:
19.64851 to 2s.f
To 2 significant figures
Looking at the digit behind the decimal
It is 6,meaning it is more than 5
So you round up to 1 and add to the digit in front
=20
828. all there is to it!
here, if you ever need with rounding (or other forms of arithmetic/math) again, use this:
thats the rounding one, but if you just click the top left, it shows you all the calculators you may need!