5. Calculate density \( \left(\mathrm{amu} / \mathrm{m}^{3}=\mathrm{g} / \mathrm{L}\right) \) of one mole of atoms. (Show your work, Report using units \( (\mathrm{g} / \mathrm{L}) \) and significant figures)

Use a calculator and the formula \( A=P(1+ \) \( \left.\frac{r}{n}\right)^{n t} \) to determine the value of an investment of \( \$ 1,400 \) at \( 8.5 \% \) for 7 years compounded monthly.

5. Resuelve las siguientes ecuaciones utilizando la fórmula cuadrática. \( \begin{array}{ll}\text { a. } x^{2}+10 x+25=0 & \text { h. } \sqrt{3} x^{2}-\sqrt{2} x-\sqrt{5}=0 \\ \text { b. } 3 x^{2}-5 x-9=0 & \text { i. } 2,5 x-1,8=-3,7 x^{2} \\ \text { c. }-8 x^{2}+3 x+1=0 & \text { j. } \frac{\sqrt{7} x^{2}}{2}-x-\frac{\sqrt{2}}{3}=0 \\ \text { d. } 16 x^{2}-3 x-12=0 & \text { k. } 9 x^{2}+2 x-1=0 \\ \text { e. } 9 x-8 x^{2}-6=0 & \text { l. } 16 x^{2}-12 x-5=0 \\ \text { f. } 12 x^{2}-7=3 x & \text { m. }-3 x^{2}+5 x+7=0 \\ \text { g. }-\frac{2 x^{2}}{3}-\frac{5}{2} x-\frac{1}{3}=0 & \text { n. }-\frac{5}{3}\left(x^{2}-3\right)+8 x^{2}=2\end{array} \)

\( ( f \circ g ) _ { ( x ) } = \)

(27. \( \frac{2}{x^{2}+3}+\frac{4}{x^{2}+7}=1 \)

\( \Delta x = \left\{ \begin{array} { l l } { 7 } & { 4 } \\ { - 2 } & { 3 } \end{array} \right. \)