Describe how definite integrals can be used to find the total distance traveled given a velocity function.

\begin{tabular}{|l|}\hline 2. Calcula el volumen \\ del sólido de \\ revolución que se \\ forma de girar sobre \\ el eje \( x \) la función \\ \( f(x)=x^{2}+x \) con \\ límites \( [-1,5] \)\end{tabular}

\( \int _{}^{}\frac{dx}{x^{2}-8x-16} d \)

Calcule el limite de \( y=x^{2}+x-6 \) \( \lim _{x \rightarrow 3} \frac{x^{2}+x-6}{x+3} \)

\( \operatorname { lx } _ { x \rightarrow 0 } = \sqrt { 1 + 3 x - 1 } \quad \lim \neq \frac { 0 } { 0 } \)

7. (8 points) Calculate the following limits. Write DNE if the limit does not exist. (a) \( \lim _{x \rightarrow 0^{+}} \frac{4}{x^{3}}= \) (b) \( \lim _{x \rightarrow 0^{-}} \frac{4}{x^{3}}= \) (c) \( \lim _{x \rightarrow 0} \frac{4}{x^{3}}= \) 8. ( 20 points) Suppose \( f \) and \( g \) are functions such that