Since the start of July, OHaganBooks.com has seen its weekly sales increase. OHaganBooks.com fits the curve w(t) = 36t2 + 245t + 6,238  (0 ≤ t ≤ 6) to its weekly sales figures as shown in the following graph. The t w coordinate plane is given with horizontal axis labeled "weeks" and vertical axis labeled "book sales." Six points are plotted with a curve through them. The curve enters the window at approximately w = 6240 on the positive w-axis, goes up and right becoming more steep, and exits the window in the first quadrant. (a) Compute the derivative function w′(t). w′(t) =

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