2. What is the condition on the variable in \( 2 \sqrt{-7 n} \) for the radicand to be a real number? \( \begin{array}{ll}\text { A } n \geq 7 & \text { B } n \leq-7 \\ \text { C } n \geq 0 & \text { D } n \leq 0\end{array} \)

Simplify the expression: \( 2.12 x^{2}+5 x-5 x^{2} \)

Expand \( \& \) Simplify \( (2 x-1)(3 x+2)(x+4) \)

\( g(x)=x^{2}+6 x \) \( h(x)=x^{2}-1 \) Write \( g(h(x)) \) as an expression in terms of \( x \) \( g(h(x))=\square \)

The following appear on a physician's intake form. Identify the level of measurement of the data. \( \begin{array}{ll}\text { (a) Weight } & \text { (b) Allergies } \\ \text { (c) Year of birth } & \text { (d) Happiness level (scale of } 0 \text { to 10) }\end{array} \)

10 Considerando que, no discurso indireto, o personagem náo fala diretamente, 6 o narrador que conts o que o personagem falou, reescreva a fala deste trecho empregando o discurso indirgto: " I...) aqueles jovens (...) dele se aproximaram e perguntaram: - Senhor, como devemos vestir-nos?".