a) ) Sketch and find the area of the surface obtained by rotating the curve y=/3x+4 for x E [3,5). Is there another curve that gives the same area? Explain. b) Determine whether the geometric series (-1) "-15n-1 6" is convergent or divergent, and if it is convergent, then find its sum. Find also the partial sum Sm and its limit as m+0, Discuss your findings

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