\( \begin{aligned} & \text { a) } \\ \times 3 & =3 \\ \div 4 & =9\end{aligned} \)

1.) Evaluate for \( x=3 \) \( 3 x-(x+2)+x \)

Simplify the expression. \( 5-[(7-6)+(8-18)] \)

b) One wall of a house consists of plywood backed by insulation. The thickness of plywood is \( (0.019 \mathrm{~m}) \) and that of insulation is \( (0.076 \mathrm{~m}) \). The inside temperature is \( 25^{\circ} \mathrm{C} \) and outside is \( 4^{\circ} \mathrm{C} \). The thermal conductivities of the insulation and plywood are, respectively, 0.030 and \( 0.080 \mathrm{~J} /\left(\mathrm{s} \cdot \mathrm{m} \cdot{ }^{\circ} \mathrm{C}\right) \), and the area of the wall is \( 35 \mathrm{~m}^{2} \). Calculate the amount of heat conducted through the wall in 1 hour.

Find the indicated root. \( -\sqrt{\frac{4}{25}} \)

Which function goes to positive co most quickly as \( x \) Increases? A \( y=\log (x)+100 \) B \( y=8^{x-9}-3 \) C \( y=x^{2}+5 x+6 \) D \( y=3 x^{3}+4 x^{3}-11 x-6 \)