Instantaneous Rate of Change of a Revenue Function

Question

The revenue from selling x hundred units of a product is modeled by the function $$R(x)= \frac{x\sqrt{x+20}}{x+5}$$. For which value of x is the instantaneous rate of change of the revenue, $$R'(x)$$, equal to zero?

Accepted Answer

$$	ext{No real critical point}$$

Answer

$$x = 0$$

Answer

$$x = -10$$

Answer

$$x = -5$$

Instantaneous Rate of Change of a Revenue Function

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