The graph of f(1) = 21 + 3z – 120z +4 has two horizontal tangents. What is the negative value of z where a horizontal tangent occurs? Preview What is the positive value of z where a horizontal tangent occurs? Preview The total cost of producing r units of stuffed alligator toys is C(x) = 0.004x + 10x + 8000. Find the marginal cost at the production level of 2000 units. Select an answer toys per dollar dollars per toy Points possible: dollars This is attempt 1 toys License

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