4 Aoife is shopping for a new TV. The TV she wishes to buy usually sells for \( € 550 \). The TV is on 'special offer' in three different shops. (a) Shop A offers \( 20 \% \) off the usual price of the TV. (i) Find \( 20 \% \) of \( € 550 \). (ii) What is the 'special offer' price of the TV in this shop? (b) Shop B offers \( \frac{1}{4} \) off the usual price of the TV. (i) Find \( \frac{1}{4} \) of \( € 550 \). (ii) What is the 'special offer' price of the TV in this shop? (c) In shop C, Aoife can pay \( € 300 \) now and \( € 25 \) at the end of each month for 12 months. (i) Calculate \( 12 \times € 25 \). (ii) What is the 'special offer' price of the TV in this shop? (d) Do you think Aoife should buy the TV in shop A, B or C? Give a reason for your answer.

Analizar hallar vértice, puntos' de corte \( (x) \) o tabular, grapical la función. \( \begin{array}{ll}\text { 1) } x^{2}-2 x+5 & \text { 41) } 2 x^{2}+7 x+15 \\ \text { 2) }-x^{2}+11 x+6 & \text { 57 }-2 x+5 x-12 \\ \text { 3) } x^{2}-3 x+4 & \end{array} \)

Find the midpoint of the line segment whose endpoints are given. \[ (8,-5),(10,-6) \] The midpoint is (Simplify your answer.)

Give the center and radius of the circle described by the equation and graph the equation. Use the graph to identify the domain and range. \( (x+5)^{2}+(y-1)^{2}=36 \) The center is \( (-5,1) \). (Type an ordered pair. Simplify your answer.) The radius is 6 . (Type an integer or a simplified fraction.) Graph the circle. Express the domain of the relation in interval notation.

MORFOLOGIA E SCRITTURA Con ciascuno dei seguenti indefiniti, scrivi, sul quaderno, due frasi: nella prima frase dovra svolgere la funzione di aggettivo; nella seconda frase dovrà svolgere la funzione di pronome. molti - alcune - altrettanto - nessuna

Bajo ciertas circunstancias la corriente alterna I(t) dada en miliamperios \( (\mathrm{mA}) \) en un circuito eléctrico en el tiempot (medido en segundos) está 8 determinada por la función \( I_{t}= \) \( \frac{2}{15} \) Sen \( (27 \pi t) \). A partir de la anterior información: 1) Determine el periodo de oscilación de la corriente. 2) Calcule la frecuencia de la función, es decir, la cantidad de oscilaciones por segundo. 3) Calcule la amplitud de la función que determina la intensidad de corriente.