Graph the function f(x)= x+4/x in the viewing rectangle [0, 10]× [0, 10]. Graph the secant line that passes through the points (1, 5) and (8, 8.5) on the same screen. Find the number c that satisfies the conclusion of the MVT on this interval. Graph the tangent line at the point (c, f (c)). Observe that it is parallel to the secant line.

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