Step 7 To estimate the slope of the tangent line at t = 15, we average the slopes of the adjacent secant lines for t = 10 and t = 20. As obtained in part (a), those slopes are msec = -136 and msec = -114.4, respectively. Therefore, the slope of the tangent line at t = 15 is as follows. (In the last step, round your answer to one decimal place.) -136 + If you use a graph of the function to estimate the slope of the tangent line at P(15, 1,040), you will see that it matches the above result. Submit Skin (you cannot come back)

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