Question $4$

Find the second derivative of the function $f(x)=9x^{3}x8$;

$22$

$54x8$

$54x$

$27x^{2}1$

$27x^{2}9$

$$

Question $5$

Let $V(t)$ be the volume, in cubic inches, of a balloon that is being filled witl does $V^{\text{'}}(8)=6$ imply?