Problem: Group (mathematics):

These symmetries are represented by functions. Each of these functions sends a point in the square to the corresponding point under the symmetry. For example, r1 sends a point to its rotation 90 clockwise around the square's center, and fh sends a point to its reflection across the square's vertical middle line. Composing two of these symmetry functions gives another symmetry function. These symmetries determine a group called the dihedral group of degree 4 and denoted D4. The underlying set of the group is the above set of symmetry functions, and the group operation is function composition. Two symmetries are combined by composing them as functions, that is, applying the first one to the square, and the second one to the result of the first application. The result of performing first a and then b is written symbolically from right to left as

What group includes the symmetries of degree 4 and denoted D4?
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A: the dihedral group

Problem: Though many of the events were outside the traditional time-period of the Middle Ages, the end of the unity of the Western Church (the Protestant Reformation), was one of the distinguishing characteristics of the medieval period. The Catholic Church had long fought against heretic movements, but during the Late Middle Ages, it started to experience demands for reform from within. The first of these came from Oxford professor John Wycliffe in England. Wycliffe held that the Bible should be the only authority in religious questions, and he spoke out against transubstantiation, celibacy and indulgences. In spite of influential supporters among the English aristocracy, such as John of Gaunt, the movement was not allowed to survive. Though Wycliffe himself was left unmolested, his supporters, the Lollards, were eventually suppressed in England.
Which Catholic practices did Wycliffe speak out against?
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Answer: transubstantiation, celibacy and indulgences

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Three-phase AC railway electrification was used in Italy, Switzerland and the United States in the early twentieth century. Italy was the major user, for lines in the mountainous regions of northern Italy from 1901 until 1976. The first lines were the Burgdorf-Thun line in Switzerland (1899), and the lines of the Ferrovia Alta Valtellina from Colico to Chiavenna and Tirano in Italy, which were electrified in 1901 and 1902. Other lines where the three-phase system were used were the Simplon Tunnel in Switzerland from 1906 to 1930, and the Cascade Tunnel of the Great Northern Railway in the United States from 1909 to 1927.
What countries used three-phase AC system in the the beginning of 20th century?
A: Italy, Switzerland and the United States

Context and question: Eleven days after the Soviet invasion of the Polish Kresy, the secret protocol of the MolotovRibbentrop Pact was modified by the GermanSoviet Treaty of Friendship, Cooperation and Demarcation,) allotting Germany a larger part of Poland and transferring Lithuania's territory (with the exception of left bank of river Scheschupe, the "Lithuanian Strip") from the envisioned German sphere to the Soviets. On 28 September 1939, the Soviet Union and German Reich issued a joint declaration in which they declared:
After amending the joint agreement, who received the larger portion of Lithuania?
Answer: Germany

Question: New Haven Harbor is home to the Port of New Haven, a deep-water seaport with three berths capable of hosting vessels and barges as well as the facilities required to handle break bulk cargo. The port has the capacity to load 200 trucks a day from the ground or via loading docks. Rail transportation access is available, with a private switch engine for yard movements and private siding for loading and unloading. Approximately 400,000 square feet (40,000 m2) of inside storage and 50 acres (200,000 m2) of outside storage are available at the site. Five shore cranes with a 250-ton capacity and 26 forklifts, each with a 26-ton capacity, are also available.
Is there an answer to this question: In terms of scale how big is the harbor?

Answer: 400,000 square feet

Question: Although STOVL aircraft are capable of taking off vertically from a spot on the deck, using the ramp and a running start is far more fuel efficient and permits a heavier launch weight. As catapults are unnecessary, carriers with this arrangement reduce weight, complexity, and space needed for complex steam or electromagnetic launching equipment, vertical landing aircraft also remove the need for arresting cables and related hardware. Russian, Chinese, and future Indian carriers include a ski-jump ramp for launching lightly loaded conventional fighter aircraft but recover using traditional carrier arresting cables and a tailhook on their aircraft.
Is there an answer to this question: What do Russian carriers include for launching heavily loaded conventional fighters?

Answer:
unanswerable