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A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic (that is, after some place, the same sequence of digits is repeated forever); if this sequence consists only of zeros (that is if there is only a finite number of nonzero digits), the decimal is said to be terminating, and is not considered as repeating.
The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.
7 μm – diameter of the nucleus of a typical eukaryotic cell [citation needed] about 7 μm – diameter of human red blood cells [89] 3–8 μm – width of strand of spider web silk [90] 5–10 μm – width of a chloroplast [91] 8–11 μm – size of a ground-level fog or mist droplet [92] [note 4] 7–12 μm – the diameter of human ...
This list of countries by traffic-related death rate shows the annual number of road fatalities per capita per year, per number of motor vehicles, and per vehicle-km in some countries in the year the data was collected.
The figure shows that 8 can be decomposed into 5 (the number of ways to climb 4 steps, followed by a single-step) plus 3 (the number of ways to climb 3 steps, followed by a double-step). The same reasoning is applied recursively until a single step, of which there is only one way to climb.
In 2013, child poverty reached record high levels, with 16.7 million children living in food insecure households, about 35% more than 2007 levels. [267] As of 2015, 44 percent of children in the United States live with low-income families. [268] In 2016, 12.7% of the U.S. population lived in poverty, down from 13.5% in 2015.
Cartogram of the world's population in 2018; each square represents 500,000 people. This is a list of countries and dependencies by population.It includes sovereign states, inhabited dependent territories and, in some cases, constituent countries of sovereign states, with inclusion within the list being primarily based on the ISO standard ISO 3166-1.
Approximately 24.7% of the global population is aged under 15, while 65.2% is aged 15–64 and 10.1% is aged 65 or over. [72] The median age of the world's population is estimated to be 31 years in 2020, [ 9 ] and is expected to rise to 37.9 years by 2050.