A desk is being sold at \( 36 \% \) discount price. The sale price is \( \$ 496 \). What was its original price?

04) Simplifque as fraçŏes algébricas a segurir, considerando que os denominadores não são nulos: a) \( \left(x^{4} z^{5}+x^{3} z^{4}\right): x^{2} z^{2} \) b) \( \left(a^{3} b^{6}+a^{2} b^{5}-a^{3} b^{4}\right): a^{3} b^{4} \) c) \( \left(12 x^{2} y^{3}+8 x^{3} y^{5}\right): 4 x y \)

What is the LCM of 15 and 20 ? \( \begin{array}{llll}415 & \text { B } 20 & \text { C } 60 & \text { D } 45\end{array} \)

\begin{tabular}{|l} Number: \\ \hline \( 3 F \) \\ From Base: \\ 16 (hexadecimal) \\ To Base: \\ 2 (binary) \end{tabular}

05) Simplifique as frações algébricas: (a) \( \left(16 x^{5}\right):\left(-4 x^{2}\right) \) (b) \( \left(36 x y^{4}\right):(-6 x y) \) (c) \( (-35 a):(+7 a) \) (d) \( \left(+3 a b^{2}\right):\left(-\frac{10}{5}\right) \) (e) \( \left(-\frac{4}{5} x^{5} y\right):\left(+\frac{4}{3} x^{2} y\right) \)

Using the definition, calculate the derivative of the function. Then find the values of the derivative as specified. \( f(x)=9+x^{2} ; f^{\prime}(-3), f^{\prime}(0), f^{\prime}(6) \)