1 proporción de familias satisfechas con su calidad de vida, por lo tanto, se debe determinar el tamaño de muestra que asegura una representatividad en cuanto al tamaño. Utilice la proporciór estimada en estudios de años anteriores, en la cual se encontró que en un \( 45 \% \) la comunidad se encontraba satisfecha, calcule el tamaño de muestra para \( 98 \%, 90 \% \) y \( 95 \% \) de confianza, determine un margen de error.

ement \( x^{2}-8 x^{2}-9=0 \)

The statement "Wrife an advertisement" is indicated in the CAPS (2011) as content that must be taught to Grade 4 HL. learners. Explain how you would teach learners to write an advertisement. You need to indicate what the advertisement must be on (e.g. a car, a shop, food, healthy living, a specific service, medicine, etc) and what activities you will expect learners to do during each of the phases of the writing process. [20]

Find the slope of the line passing through the points \( (-9,-6) \) and \( (-4,5) \).

Solve the quadratic equation by factoring: \( x^{2} - 9 = 0 \)

If the function \( f \) is a polynomial function of fourth degree and its domain is \( \mathbb{R} \), then the greatest number of the critical points of the function \( f(x) \) is (a) 1 (b) 2 (c) 3 (d) 4