A. ctangle initially has dimensions 2 cm by 7 cm . All sides begin increasing in length at a rate of \( 2 \mathrm{~cm} / \mathrm{s} \). At what rate is the area of the rectangle increasing after 16 s ? Let \( \mathrm{A}, \mathrm{b} \), and h be the area, base, and height of a rectangle, respectively. Write an equation relating \( \mathrm{A}, \mathrm{b} \), and h . \( \mathrm{A}=\mathrm{b} \times \mathrm{h} \) Differentiate both sides of the equation with respect to t . \( \mathrm{dA}= \)

Find \( (A) f^{\prime}(x) \), (B) the partition numbers for \( f^{\prime} \), and \( (C) \) the critical numbers of \( f \). \( f(x)=x^{3}-3 x+7 \) (A) \( f^{\prime}(x)= \) (B) Find the partition numbers for \( f^{\prime} \). Select the correct choice below and, if necessary, fill in the answer box to cor A. The partition pumber(s) is/are \( x=\square \). There are no partition numbers. A. The critical number(s) is/are \( x=\square \). (C) Find the critical numbers for \( f \). Select the correct choice below and, if necessary, fill in the answer box to comp (Use a comma to separate answers as needed.) B. There are no critical numbers.

Find \( f^{\prime}(x) \). \( f(x)=\left(3 x^{5}+4\right)^{3} \) \( f^{\prime}(x)=\square \)

Find the indicated derivative. \[ y^{\prime} \text { for } y=\left(3 x^{3}+5 x^{2}\right)(4 x-3) \] \( y^{\prime}=\square \)

Use L'Hôpital's rule to find the following limit and check the answer using an algebraic simplification. \( \lim _{x \rightarrow 8} \frac{x^{2}-x-56}{x-8} \) \( \lim _{x \rightarrow 8} \frac{x^{2}-x-56}{x-8}=\square \) (Simplify your answer.)

Find the indicated derivative for the function. \( h^{\prime \prime}(x) \) for \( h(x)=5 x^{-3}-9 x^{-6} \) \( h^{\prime \prime}(x)=\square \)