13. Escreva cada um dos seguintes números como uma potência de base 10. \( \begin{array}{ll}\text { a) } 1 & \text { d) } 0,0000001 \\ \text { b) } 0,001 & \text { e) } 1000000 \\ \text { c) } 100 & \text { f) } 0,1\end{array} \)

What is the absolute value of \( -7 \)?

Write in terms of \( i \). Simplify your answer as much as possible, \( -\sqrt{-9} \)

Sea \( f: \mathbb{R} \mapsto \mathbb{R} \) tal que \( f(x)=\left\{\begin{array}{cc}3 x-6, & |x-2|<3 \\ 0, & x \geq 5 \vee x \leq-1\end{array}\right. \) Entonces la regla de correspondencia de \( 3-f(3-x) \) es

b. \( \sqrt[4]{20} \cdot \sqrt{50} \)

Perform the indicated operations. Write the result in scientific notation rounded to three significant digits. \[ \left(\frac{9.6 \times 10^{-3}}{\left(2.45 \times 10^{-4}\right)\left(1.1 \times 10^{5}\right)}\right)^{6} \]