A. 2 ft 5 in + 9 in b. 4 yd 8 in + 6 yd 6 in
c. 29 yd 2 ft 11 in + 55 yd 1 ft 10 in + 13 yd 1 ft 3 in
d. 4,839 sq yd 8 sq ft 139 sq in + 7 sq ft 124 sq in

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)

-5, your answer was correct

this would be 35. 35 + 5 = 40. you take the known constant and subtract by the answer of the equation and you get y.