QUES: Indian astronomer and mathematician Aryabhata (476-550), in his Aryabhatiya (499) introduced a number of trigonometric functions (including sine, versine, cosine and inverse sine), trigonometric tables, and techniques and algorithms of algebra. In 628 AD, Brahmagupta suggested that gravity was a force of attraction. He also lucidly explained the use of zero as both a placeholder and a decimal digit, along with the Hindu-Arabic numeral system now used universally throughout the world. Arabic translations of the two astronomers' texts were soon available in the Islamic world, introducing what would become Arabic numerals to the Islamic World by the 9th century. During the 14th–16th centuries, the Kerala school of astronomy and mathematics made significant advances in astronomy and especially mathematics, including fields such as trigonometry and analysis. In particular, Madhava of Sangamagrama is considered the "founder of mathematical analysis".
What did Brahmagupta use the number zero for?

ANS: a placeholder and a decimal digit

QUES: The ESA requires that critical habitat be designated at the time of or within one year of a species being placed on the endangered list. In practice, most designations occur several years after listing. Between 1978 and 1986 the FWS regularly designated critical habitat. In 1986 the Reagan Administration issued a regulation limiting the protective status of critical habitat. As a result, few critical habitats were designated between 1986 and the late 1990s. In the late 1990s and early 2000s, a series of court orders invalidated the Reagan regulations and forced the FWS and NMFS to designate several hundred critical habitats, especially in Hawaii, California and other western states. Midwest and Eastern states received less critical habitat, primarily on rivers and coastlines. As of December, 2006, the Reagan regulation has not yet been replaced though its use has been suspended. Nonetheless, the agencies have generally changed course and since about 2005 have tried to designate critical habitat at or near the time of listing.
Where have the majority of critical habitats in the Midwest and Eastern states been located geographically?

ANS: primarily on rivers and coastlines

QUES: Beyond this, BYU also runs a very large study abroad program, with satellite centers in London, Jerusalem, and Paris, as well as more than 20 other sites. Nearly 2,000 students take advantage of these programs yearly. In 2001, the Institute of International Education ranked BYU as the number one university in the U.S. to offer students study abroad opportunities. The BYU Jerusalem Center, which was closed in 2000 due to student security concerns related to the Second Intifada and, more recently, the 2006 Israel-Lebanon conflict, was reopened to students in the Winter 2007 semester.
In which 2006 semester did BYU Jerusalem reopen to students?

ANS: unanswerable

QUES: In recent years, the nightclubs on West 27th Street have succumbed to stiff competition from Manhattan's Meatpacking District about fifteen blocks south, and other venues in downtown Manhattan.
Which businesses on 27th Street face competition from other venues in dowtown Manhattan?

ANS:
nightclubs