Sketch a tangent line at $x=4$. Estimate its slope by calculating the slope of secant lines from $x=4$ to $x=4+h$ for the following values of $h$:
(Round above answers to nearest 1000th or less.)
The slope of the tangent line appears to be $\displaystyle\diff{f}{x}\bigg|_{x=4} =$

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##### Hint

To sketch the second tangent, drag $n_t$ (for number of tangents) to 2, and move the orange point to the proper location to specify the required tangent line.

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