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800 (eight hundred) is the natural number following 799 and preceding 801. It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40.
A peak or projection from the top of a hill or mountain, or any rounded protrusion of land, especially a small but prominent or isolated hill with steep sides; a boulder or an area of resistant rock protruding from the side of a hill or mountain. The term is used primarily in the southern United States. [5] knoll.
Contents. hide. (Top) Class 000 – Computer science, information, and general works. Class 100 – Philosophy and psychology. Class 200 – Religion. Class 300 – Social sciences. Class 400 – Language. Class 500 – Science.
Several other prefixes, including 800-484, 800-703, 800-744, and 800-904 are reserved by the FCC. NPA-911 is forbidden as 9-1-1 is an emergency telephone number . (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.)
Calling an 800-number is free of charge. Calling a 400-number incurs a local access charge. 800-numbers are accessible only to land-line subscribers, while 400-numbers are accessible to all land-line and mobile users. 800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话".
800 — 810: 811: 812 — 819: 820 — 899 900 — 910: 911: 912 — 919: 920 — 999 152 area codes 8 special service codes: 640 CO codes
Geography (from Ancient Greek γεωγραφία geōgraphía; combining gê 'Earth' and gráphō 'write') is the study of the lands, features, inhabitants, and phenomena of Earth. [1] Geography is an all-encompassing discipline that seeks an understanding of Earth and its human and natural complexities —not merely where objects are, but also ...
With an estimated population of 580 million and an area of 24,709,000 km 2 (9,540,000 mi 2 ), the northernmost of the two continents of the Western Hemisphere [1] is bounded by the Pacific Ocean on the west; the Atlantic Ocean on the east; the Caribbean Sea on the south; and the Arctic Ocean on the north. The northern half of North America is ...
Life expectancy, more technically called the curtate expected lifetime and denoted , [a] is the mean of —that is to say, the expected number of whole years of life remaining, assuming survival to age . [152] So, (2) Substituting ( 1) into the sum and simplifying gives the final result [153]
Extreme poverty [a] is defined by the United Nations (UN) as "a condition characterized by severe deprivation of basic human needs, including food, safe drinking water, sanitation facilities, health, shelter, education and information. It depends not only on income but also on access to services". [1] Historically, other definitions have been ...