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Two to the power of n, written as 2 n, is the number of values in which the bits in a binary word of length n can be set, where each bit is either of two values. A word, interpreted as representing an integer in a range starting at zero, referred to as an "unsigned integer", can represent values from 0 (000...000 2) to 2 n − 1 (111...111 2) inclusively.
Direct instruction (DI) is the explicit teaching of a skill set using lectures or demonstrations of the material to students. A particular subset, denoted by capitalization as Direct Instruction, refers to the approach developed by Siegfried Engelmann and Wesley C. Becker that was first implemented in the 1960s.
Seven is the lowest natural number that cannot be represented as the sum of the squares of three integers. A seven-sided shape is a heptagon. [17] The regular n-gons for n ⩽ 6 can be constructed by compass and straightedge alone, which makes the heptagon the first regular polygon that cannot be directly constructed with these simple tools. [18]
The Romans used a duodecimal rather than a decimal system for fractions, as the divisibility of twelve (12 = 2 2 × 3) makes it easier to handle the common fractions of 1 ⁄ 3 and 1 ⁄ 4 than does a system based on ten (10 = 2 × 5).
For students entering college directly after high school, the process typically begins in eleventh grade, with most applications submitted during twelfth grade. [2] Deadlines vary, with Early Decision or Early Action applications often due in October or November, and regular decision applications in December or January.
Oakland's mayor is limited to two terms. There are no term limits for the city council. Oakland City Hall was evacuated after the 1989 Loma Prieta earthquake until US$ 80M seismic retrofit and hazard abatement work was complete in 1995. [182] City offices had to be housed in leased space and other locations.
The most outstanding progress in terms of percentage increase of boys' enrollment was in East Africa, where the net enrollment of boys increased by 27% (to 60%) and of girls by 18% (to 50%). [86] For girls in Southern Africa, the comparable figures for girls were 23% (to 7%) and for boys, 16% (to 58%). [ 86 ]