Dna has two strands if the sequence of nucleotides of one strand was known is it possible to use that information to determine the sequence of the second strand

Yes it's possible because once you know one side, u already know what goes with what

Yes it is possible to use the sequence of nucleotide of one strand to make the second strand.

This is why the DNA strands are called conservative strand
Conservative replication would leave the two original template DNA strands together in a double helix and would produce a copy composed of two new strands containing all of the new DNA base pairs.and 

You should check out the situation and then ask questions like “are you choking”? and if they are able to respond they should nod and if they are not making sound do the heimlich maneuver. i hope this .