(1 point) If the bacteria in a culture double in 1 hours, how many hours will it take before 6 times the original number is present? It will take hours. (Answer should be accurate to within at least three digits.)

3. \( h(x)=\left(\frac{1}{5} x\right)^{2}-4 \)

(7) Halla el valor desconocido en cada proborción. \( \begin{array}{ll}\text { a. } \frac{5}{10}=\frac{y}{8} & \text { b. } \frac{4}{m}=\frac{2}{11} \\ \text { c. } \frac{12}{0.5}=\frac{n}{3} & \text { d. } \frac{14}{16}=\frac{z}{8} \\ \text { e. } \frac{x+1}{5}=\frac{15}{6} & \text { f. } \frac{5}{2}=\frac{b-1}{4} \\ \text { g. } \frac{10}{2 a}=\frac{20}{4} & \text { h. } \frac{3 y}{2}=\frac{18}{4}\end{array} \)

Solve the quadratic by factoring \[ x^{2}-7 x=10 x-70 \]

the inverse function of \( f(x)=(x+5)^{3} \) tructor use only \( -10 B . C O R) \)

(c) \( \lim _{w \rightarrow a} \frac{a^{2}-w^{2}}{a-w}= \)