Which sentence correctly forms the plural of the number 6?
a.
herb's zip code has four 6s' and a 2.
b.
herb's zip code has four 6s and a 2.
c.
herb's zip code has four 6's and a 2.

What happens when the flat cakes come out of the broiler? a) they are ready to be served. b) they should be lightly salted. c) they are to be placed in a hot oven. d) they need to cool for fifteen minutes.