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Compute and graph the following:

(a) -15+i/4+2i (multiply by the conjugate and I got -2.9+1.7i

(b) (27

^{1/3})

^{4}Now for some reason I have a feeling this has 3 solutions using complex numbers but can not figure them out, I've tried using polar coordinates and tried googling/wikipedia for help on this I'm just really stuck.

(c) 27

^{(4 + 1/3)}I presume this can also have 3 solutions if i split it up into 27

^{1/3}times 27

^{4}

Any help on this greatly appreciated.