28. The graph of f(x) = x+1¹ is shown. (a) Use the graph to approximate the slope of the tan- gent line to f at the following points: (0,1) and (1,0.5). (b) Using the definition, find f'(x). (c) Find the slope of the tangent line at the points (0, 1) and (1,0.5). m 24 N

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