Which of the following best describes the function(s) of the macsublayer? a. it performs data compression, reformatting, and encryption. b. it appends a node's physical address to frames before they'retransmitted. c. it interprets program requests and requirements to provide aninterface between applications and the network. d. it manages flow control, and issues requests for retransmission ofdata that has suffered errors. e. it translates network addresses into their physical counterpartsand determines routing.

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The volume v and paper surface area a of a conical paper cup are given by where r is the radius of the base of the cone and h is the height of the cone. a. by eliminating h, obtain the expression for a as a function of r and v. b. create a user-de ned function that accepts r as the only argument and computes a for a given value of v. declare v to be global within the function. c. for v ! 10 in.3 , use the function with the fminbnd function to compute the value of r that minimizes the area a. what is the corresponding value of the height h? investigate the sensitivity of the solution by plotting v versus r. how much can r vary about its optimal value before the area increases 10 percent above its minimum value?

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