47. Figure 14 displays data collected by the biologist Julian Huxley (1887–1975) on the average antler weight W of male red deer as a function of age t. Estimate the derivative at t = 4. For which values of f is the slope of the tangent line equal to zero? For which values is it negative? Antler weight W(kg) 8- 7. 6- 5- 4- 10 12 14 Age (years) FIGURE 14

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