dead branch falls from a tree at the top of an 80 m high cliff. The function d (t) = 80 - 5t2, where 0 < t < 4, gives the height d, in meters, of the branch above the ground after A time t, in seconds.   A) Determines the average rate of change in height between 1 and 3 s.   B) Calculate d (2).   C) Using the block 3 approach,

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