Given an array of distinct n integers, find if there exists a quadruple (x, y, z, w x+y+z+w= 0.

if there are multiple such quadruples, you may output any of them.

(a) design an efficient algorithm for the problem in terms of worst-case running time.

(b) can you get a more efficient algorithm in terms of expected running time?

For a typical middle-income family, what is the estimated cost of raising a child to the age of 18? $145,500 $245,340 $304,340 $455,500

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What is wi-fi infrastructure? a metropolitan area network that uses radio signals to transmit and receive data a communications technology aimed at providing high-speed wireless data over metropolitan area networks a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves includes the inner workings of a wi-fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a wi-fi signal