Let y= x+n where x and n are independabt zero -mean
gaussianrandom variable with different variance
a. plot the correlation coeffiecient between the"observed
signal " y and the "desired signal" x as a function ofthe signal to
noise ratio ox/os.
b. find the minimun mean sqaure error estimator for x in
termof y. find the mean square error for the estimator.

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)