a. explain below what a point of diminishing returns for a revenue equation is and how this point (if it exists) affects investment decision.

b. the revenue equation R(x) = -3.21x^3+ 62.14x^2 + 172.92x + 48.5 for 0 ≤ x ≤ 14. where x represents the number of farms (in millions). calculate the first and second derivative of this function and use them to calculate the diminishing point of return for this function if it exists. show work.

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