Suppose we want to calculate V9.3. Let f(x) = Vx. From here, we can compute f(9) exactly by mental math-but f(9.3), the quantity we want, is harder. Find an equation of the line tangent to y = f(x) at the point (9, f(9)). Show me the method by which you found it. Verify for yourself on a graphing utility that the line you've found is correct, but don't show me the graph.

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