The depth of a river at a certain point is modeled by the function W defined above, where W(t) is measured in feet and time t is measured in hours.
(A) Find W′(8) . Using correct units, explain the meaning of W′(8) in the context of the problem.
(B)The graph of W is concave down for 3≤t≤3.5 . Use the line tangent to the graph of W at t=3 to show that W(3.5)≤9
(C) in picture.

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