19. GCSS Persevere with Problems The speed of a giraffe is \( 250 \% \) of the speed of a squirrel. If a squirrel's speed is 12 miles per hour, find the speed of a giraffe.

\begin{tabular}{l} Camacho compra un camión monstruo. El \\ precio del camión es \( x \) pesos, y también \\ debe pagar \( 13 \% \) de impuestos. \\ ¿Cuáles de las siguientes expresiones \\ pueden representar lo que Camacho paga \\ en total por el camión? \\ Elige 2 respuestas: \\ A \( (1+0.13) x \) \\ B 13 \\ \hline C \( 13 x \) \\ \hline D \( 1.13 x \)\end{tabular}

4. Calcule a massa de óxido cúprico \( (\mathrm{CuO}) \) obtida a partir de \( 2,54 \mathrm{~g} \) de cobre metálico \( (\mathrm{Cu}) \). Dados: \( (\mathrm{O}=16: \mathrm{Cu}=63,5) \) \[ \underline{2 \mathrm{Cu}}+\mathrm{O}_{2} \rightarrow \underline{2 \mathrm{CuO}} \]

Write an equation in standard form for the line that passes through the given points. \( (0,7) \) and \( (6,0) \) The equation of the line in standard form is (Type your answer in standard form.)

Select all of the following that are concurrent powers under the principle of federalism. Select 5 correct answer(s) establish courts secure national borders establish and enforce laws army and navy borrow money banks

4. Si \( M=\sqrt{M}-1 y\left(N=N^{2}+9\right. \) calcula (4) \( \begin{array}{lllll}\text { a. } 8 & \text { b. } 16 & \text { c. } 10 & \text { (d.) } 25 & \text { e. } 5\end{array} \)