QUES: If the sequences ended then the sum could defined in terms of starting with the rightmost digits and expressing the sum in terms of the carry operation

correct the punctuation.

CORRECTED: If the sequences ended then the sum could defined in terms of starting with the right-most digits and expressing the sum in terms of the carry operation.

QUES: Without a population that can read and understand what the political issues are about what are people going to vote for And if people cant write how can they participate in the written debate

correct the punctuation.

CORRECTED: Without a population that can read and understand what the political issues are about, what are people going to vote for? And if people can't write, how can they participate in the written debate?

QUES: This makes it a good alternative to emails which are often left unread

correct the punctuation.

CORRECTED:
This makes it a good alternative to e-mails, which are often left unread.