In 1990 first-class mail cost $0.25 for the first ounce or fraction, and $0.20 for each additional ounce or fraction. Annette sent two letters. One weighed 3 ounces. The other weighed 5 1/2 ounces. What was the total cost?

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aloha~! my name is zalgo and i am here to you out on this amazing day. to answer your question, yes, nonzero numbers can have a greatest common factor and that would be 1. still don't get it? let me considering every number is divisible by 1 and hence every number has 1 as a factor of theirs. so, if 2 nonzero numbers didn't share any gcf (greatest common factor), they would still have a factor in common and that would be 1.

i hope that this ! : p

"stay and stay proud! " - zalgo

(by the way, do you mind marking me as brainliest? i'd greatly appreciate it! mahalo! x3)