Problem: London:

Along with professional services, media companies are concentrated in London and the media distribution industry is London's second most competitive sector. The BBC is a significant employer, while other broadcasters also have headquarters around the City. Many national newspapers are edited in London. London is a major retail centre and in 2010 had the highest non-food retail sales of any city in the world, with a total spend of around 64.2 billion. The Port of London is the second-largest in the United Kingdom, handling 45 million tonnes of cargo each year.

What is the second largest port in the UK?
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A: The Port of London

Problem: On 11 April 1898 American Joshua Slocum, on his famous and epic solo round the world voyage arrived at Jamestown. He departed on 20 April 1898 for the final leg of his circumnavigation having been extended hospitality from the governor, his Excellency Sir R A Standale, presented two lectures on his voyage and been invited to Longwood by the French Consular agent.
When did Joshua Slocum depart from Jamestown to continue his trip?
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Answer: 20 April 1898

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Exchanging "+" and "" in the expression, i.e. permuting the two solutions of the equation can be viewed as a (very simple) group operation. Similar formulae are known for cubic and quartic equations, but do not exist in general for degree 5 and higher. Abstract properties of Galois groups associated with polynomials (in particular their solvability) give a criterion for polynomials that have all their solutions expressible by radicals, i.e. solutions expressible using solely addition, multiplication, and roots similar to the formula above.
Which group cannot be expressed using radicals?
A: unanswerable

Context and question: Sometimes people of mixed African-American and Native American descent report having had elder family members withholding pertinent genealogical information. Tracing the genealogy of African Americans can be a very difficult process, as censuses did not identify slaves by name before the American Civil War, meaning that most African Americans did not appear by name in those records. In addition, many white fathers who used slave women sexually, even those in long-term relationships like Thomas Jefferson's with Sally Hemings, did not acknowledge their mixed-race slave children in records, so paternity was lost.
What identified slaves by name before the American Civil War?
Answer: unanswerable

Question: According to one of her biographers, Giles St Aubyn, Victoria wrote an average of 2,500 words a day during her adult life. From July 1832 until just before her death, she kept a detailed journal, which eventually encompassed 122 volumes. After Victoria's death, her youngest daughter, Princess Beatrice, was appointed her literary executor. Beatrice transcribed and edited the diaries covering Victoria's accession onwards, and burned the originals in the process. Despite this destruction, much of the diaries still exist. In addition to Beatrice's edited copy, Lord Esher transcribed the volumes from 1832 to 1861 before Beatrice destroyed them. Part of Victoria's extensive correspondence has been published in volumes edited by A. C. Benson, Hector Bolitho, George Earle Buckle, Lord Esher, Roger Fulford, and Richard Hough among others.
Is there an answer to this question: What did Beatrice do to her mothers diaries before her death?

Answer: unanswerable

Question: While worship in the Temple in Jerusalem included musical instruments (2 Chronicles 29:2527), traditional Jewish religious services in the Synagogue, both before and after the last destruction of the Temple, did not include musical instruments given the practice of scriptural cantillation. The use of musical instruments is traditionally forbidden on the Sabbath out of concern that players would be tempted to repair (or tune) their instruments, which is forbidden on those days. (This prohibition has been relaxed in many Reform and some Conservative congregations.) Similarly, when Jewish families and larger groups sing traditional Sabbath songs known as zemirot outside the context of formal religious services, they usually do so a cappella, and Bar and Bat Mitzvah celebrations on the Sabbath sometimes feature entertainment by a cappella ensembles. During the Three Weeks musical instruments are prohibited. Many Jews consider a portion of the 49-day period of the counting of the omer between Passover and Shavuot to be a time of semi-mourning and instrumental music is not allowed during that time. This has led to a tradition of a cappella singing sometimes known as sefirah music.
Is there an answer to this question: What is forbidden on the Sabbath because it was considered work?

Answer:
unanswerable