Which did freshwater not provide? transportation \[ \begin{array}{l}\text { food } \\ \text { civilization } \\ \text { drinking }\end{array} \]

1. Simplifique al máximo cada expresión. a. \( \left(27 x^{9}\right)^{\frac{1}{3}} \) b. \( \left(3 x^{\frac{1}{2}} y^{\frac{3}{2}}\right)^{2} \) c. \( \left(\left(-4 x^{6} y^{-3}\right)\left(-2 x^{-2} y^{2}\right)\right)^{\frac{1}{2}} \) d. \( \frac{\left(x^{-\frac{1}{8}} y\right)^{-2}\left(x^{4} y^{6}\right)^{-\frac{1}{2}}}{x^{\frac{1}{4}} y^{4}} \)

e. Is the square footage of a house a discrete random variable, a continuous random variable, or not a random variable? A. It is a discrete random variable. B. It is a continuous random variable. C. It is not a random variable.

Solve for \( a \). \[ \begin{array}{l} \\ a^{2}=320 \\ \text { Enter your answers in the boxes. }\end{array} \] \( a=\square \) or \( a=\square \)

Multiply. \[ \frac{x^{2}+3 x+2}{x^{2}-3 x+2} \cdot \frac{x-2}{3 x+3} \]

rms: \( 4 a c-2 c-(-3 a c)-5 c \)