50 g calcium carbonate is heated to form calcium oxide and \( \mathrm{CO}_{2}(\mathrm{~g}) \) Calculate the percentage yield if 21 g facut Calciam axiae. is formed.

* oxplica de comio los sisiomas digestivos, respiraturios, y circulatorio se velacionan y trabajan En conwunto para proveer oxigeno s nurrientes a todos a todas las celut del cuerpo

3. For a given increase in the interest rate, investment___ aggregate spending___ and total income A \( \quad \) marks) B Increaseses; increases; increases C Decreases; decreases; decreases D Increases; decreases; decreases

rectas \( x=2, x=11 \), alrededor del eje \( X \). 3. Obtén el volumen del sólido que se genera al hacer girar la región limitada por la curva \( f(x)=x^{2} y \) las rectas \( x=0, x=3 \) alrededor del eje \( X \).

What would the effect of contractionary monetary policy be on the aggregate level of income and spending? A An increase in the aggregate level of income and spending. B A decrease in the aggregate level of income and spending. C An increase in the aggregate level of income and a decrease in the aggregate level of spending. D A decrease in the aggregate level of income and an increase in the aggregate level of spending.

5. Für \( k>0 \) ist die Funktion \( f_{k} \) gegeben durch \( f_{k}(x)=x^{3}-k^{2} x \). Berechnen Sie \( k \) so, dass der Graph von \( f_{k} \) mit der \( x \)-Achse eine Fläche mit dem Inhalt 8 einschließt.