The growth of a red oak tree is approximated by the function G = -0.003t3 + 0.137t2
Question:
(a) Use a graphing utility to graph the function.
(b) Estimate the age of the tree when it is growing most rapidly. This point is called the point of diminishing returns because the increase in size will be less with each additional year.
(c) Using calculus, the point of diminishing returns can be found by finding the vertex
of the parabola y = 0.009t2 + 0.274t + 0.458. Find the vertex of this parabola.
(d) Compare your results from parts (b) and (c).
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