13. The signum function is defined as follows: -1, if x < 0 f(x) 0, if x = 0 1, if x > 0 a. Sketch the graph of the signum function. b. Find each limit, if it exists. i. lim f(x) x-+0 c. Is f(x) continuous? Explain. 1. lim f(x) iii. lim f(- 240

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