Activity 7 3.1 Choose the correct word in bracket to make the following statements true. 3.1 .1 ( \( 5 \% / 90 \% \) ) of South Africa's energy is thermal. 3.1 .2 (Water/coal) is used to produce thermal energy. 3.1.3 Hydro energy is a (non- renewable/renewable) resource. 3.1.4 (Hydro energy/nuclear) is halfway between a renewable and a non-renewable energy resource 3.1.5 Nuclear energy uses (coal/uranium) as a mineral. 3.1.6 South Africa nuclear energy plant is at Koeberg near Durban/Cape town).

Nombre Resuelve los problemas. Juwad recogió 30 bolsas de manzanas el lunes y después las vendió en su puesto de frutas a \( \$ 3.45 \) cada una. La semana siguiente recogió y vendió 26 bolsas.

Question 1 A single number designed to assess the variation in a data set is called a

2 The eighth and tenth terms of a sequence are 64 and 100. If the sequence is either arithmetic or geometric, the ninth term can not be \( \begin{array}{ll}\text { 1) }-82 & \text { 3) } 80 \\ \text { 2) }-80 & \text { 4) } 82\end{array} \)

na temperatura de \( 20^{\circ} \mathrm{F} \) equivale a \( 68^{\circ} \mathrm{C} \), y \( 0^{\circ} \mathrm{F} \) equivalen a \( 86^{\circ} \mathrm{C} \). eratura en grados \( { }^{\circ} \mathrm{F}(x) \) con la temperatura y grados \( { }^{\circ} \mathrm{C}(y) \) \( y=\frac{5}{9} x+\frac{520}{9} \) \( y=\frac{5}{9} x+\frac{160}{9} \) \( y=\frac{5}{9} x-\frac{520}{9} \) \( y=\frac{5}{9} x-\frac{160}{9} \) encuentra la temperatura \( y \) en \( { }^{\circ} \mathrm{C} \) que cor- esponden a \( 23{ }^{\circ} \mathrm{F} \). \( y=-4^{\circ} \mathrm{C} \) \( y=-6^{\circ} \mathrm{C} \) \( y=-7^{\circ} \mathrm{C} \) \( y=-5^{\circ} \mathrm{C} \)

Find \( \frac{d y}{d x} \) if \( y=\left(\frac{1+2 x}{1+x}\right)^{2} \)