Consider the parabola given by the equation: \( f(x)=2 x^{2}+14 x+9 \) Find the following for this parabola: A) The vertex: B) The vertical intercept is the point C) Find the coordinates of the two \( x \)-intercepts of the parabola and write them as a list, separated by commas:

Determine the value of \( C \) that makes each expression a Perfect square. \( x^{2}+14+c \)

6. Al resolver el sistema \( \left\{\begin{array}{l}5 x+6 y=20 \\ 4 x-3 y=-23\end{array}\right. \) \( \begin{array}{rlrl}5 x . x=2 & \text { b. } x=-2 & \text { c. } x=5 & \text { d. } x=-5 \\ y=5 & y=5 & y=-2 & y=2\end{array} \)

What is a proportional relationship?

138. Hallar el resto de la división \( \frac{[(x+4)(x+3)(x+2)(x+1)+3]^{4}}{x^{2}+5 x+5} \) \( \begin{array}{lllll}\text { a. } 25 & \text { b. } 34 & \text { c. } 43 & \text { d. } 27 & \text { e. } 6\end{array} \)

b. La signora Adele oggi ha venduto un piumone a 65 euro e alcuni completini per bambini. In tutto ha incassato 275 euro. Ogni completino ha il prezzo di 35 euro. Quanti completini ha venduto?