Hi all

I face problem in ( Signifincant digits )

sometimes in question want the answer 2 or 3 or 4 ..etc

for example :

Evaluate X to 4 significant digits in question If

log x = - 1.2543

or

Evaluate X to 5 significant ditis in

X = In ( 3.4562x 10 ^15 )

How I Find the solution by 5 significant or 2 or etc