Emilia sale a comprar sandalias el 3 de octubre. a) En la zapatería Junín encuentra unas que le gustan y cuestan \( \$ 45000 \). El vendedor le dice que a partir del \( 15 / 10 \) estarán en ofer con un \( 30 \% \) de descuento. ¿Cuánto dinero ahorra si espera hasta \( 15 / 10 \) para comprar esas sandalias? b) En la zapatería Maipú encuentra las mismas sandalias a \( \$ 40000 \) Allí, le informan que a partir del 15/10 harán una oferta de un \( 20 \% \) de descuento. ¿Cuánto diner espera hasta el \( 15 / 10 \) para comprar allí esas sandalias? c) ¿En cuál de las dos zapaterías le conviene comprar las sandalia

9. \( 5 \frac{1}{10} \cdot 7 \frac{7}{8} \)

\[ g(x)=\frac{x^{2}+9 x+18}{x^{2}-64} \] Hallar \( g(-8) \)

Solve \( x^{2}=-9 \), where \( x \) is a real number. Simplify your answer as much as possible. If there is more than one solution, separate them with commas. If there is no solution, click on "No solution".

4. Im conducting a study about the heights and weights of Rutgers undergraduates. To do this, I send out a survey by email to 500 randomly selected undergraduates and ask them for both their height and their weight. (a) ( 2 points) After collecting my data, I find that only 152 of the people in my sample returned the survey. Do you think the topic of the survey contributes to the non-response? What about the method of survey distribution? (b) ( 1 point) In addition, a large proportion of those who responded gave their weights in multiples of 5 (e.g., 165, 170, 185). Can you identify what might be happening here?

A. Calcula: a) \( \frac{5}{6}+\frac{7}{9}+\frac{4}{3} \)