11. tell whether the sequence is arithmetic. if it is, what is the common difference?
19, 12.5, -2
no
yes: 1/7
yes; 7
yes; -7

No.

Step-by-step explanation:

19 - 12.5 = 6.5

12.5 - (-2) = 14.5

The differences between two pairs of consecutive numbers of the sequence are not equal, so there is no common difference, and the sequence is not arithmetic.

Step-by-step explanation:

The given sequence is

The given sequence is not arithmetic, because there's no difference pattern. For example, the difference between 12.5 and 19 is -6.5, and the difference between 12.5 and -2 is 14.5, therefore it's not an arithmetic sequence, because they difference is not the same for all terms.

Therefore, the answer is the first choice NO.

55? i think maybe

step-by-step explanation:

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)