After the energy crisis of the 1970s and the opec oil embargo, the us changed its ideas about foreign oil dependency. which of the following statements best represents the change that took place at this time? a) the us increased its dependency on foreign oil. b) the us decreased its dependency on foreign oil and the economic vulnerability it brings. c) the us began using only renewable energy sources. d) the us began building new nuclear power plants to replace fossil fuel use. e) the us did not make any changes to its foreign oil policies.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

answer

explanation

the given equation is

we can rewrite this as:

let

then the equation becomes:

the factors of 8 that sum up to -9 are {-1,-8}

we split the middle term with these factors to obtain,

we factor by grouping to obtain:

apply the zero product property to get:

but