Cuánto mide el área de la arte del pentágono rregular GFHCD que queda de color gris en la figura?

\( \mathbf{1 1}- \) A maior raiz da equação \( (x+5) \cdot(x-3)=65 \) vale: \( \begin{array}{lllll}\text { a) }-10 & \text { b) } 8 & \text { c) } 12 & \text { d) } 18 & \text { e) }-18\end{array} \)

Identify the coefficient and the degree of ea \( 31 x^{2} y^{7}-5 x^{3} y z-1 \) The coefficient of \( 31 x^{2} y^{7} \) is 31 The degree of \( 31 x^{2} y^{7} \) is 9 The coefficient of \( -5 x^{3} y z \) is

\( \left. \begin{array} { l } { S O Ln , } \\ { \triangle C D E \sim \triangle A B C } \\ { D E = 10 cm } \\ { E C = 7 cm } \\ { C B = 6 cm } \\ { B A = 8 cm } \\ { \cap C = ? } \end{array} \right. \)

Divide. Write answers with remainders in two ways. Then check your answer. \( 7 \longdiv { 3 0 . 7 } \mathrm { R } 1 \) Another way: \( \square \frac{\square}{\square} \)

Write an equation of the line perpendicular to the given line that conta \( P(7,-5) ; y=\frac{1}{4} x+5 \) Write an equation for the line in point-slope form. \( y-5= \)