hn and Amelia have a baby daughter, Sonia. John is 23 kg heavier than Amelia, who ur times as heavy as Sonia. Their combined weight is 122 kg . How heavy is each pers

Solve for \( \mathrm{u}_{1} \) \[ \frac{1}{1+2}=-\frac{5}{1-1} \] If there is mere than one solution, separate them with commas, if there is no solution, click on "No solution",

1. Use cross products to determine which proportions are true statements. Select all that apply. \( \frac{12}{40} \stackrel{?}{=} \frac{18}{60} \) \( \frac{8}{16} \stackrel{?}{=} \frac{3}{6} \) \( \square \frac{2}{9} \stackrel{?}{=} \frac{11}{49.5} \) \( \square \frac{3}{7} \stackrel{?}{=} \frac{13.5}{34} \)

los siguientes ejercicios, indicar el equivalente en fracciór \( \%= \) \( 0 \%= \)

3. Which equation is a true proportion? \( \frac{4}{6}=\frac{8}{24} \) \( \frac{7}{14}=\frac{21}{28} \) \( \frac{3}{2}=\frac{2}{3} \) \( \frac{9}{20}=\frac{45}{100} \)

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