In situ conservation refers to conserving species in their natural environment; ex situ conservati refers to keeping the species alive in other settings, such as zoos and seed collections. Explain y the former is to be preferred. ( 15 marks)

8. Find the following products and verify the results for \( x=2 \) and \( y=1 \) : (i) \( \left(2 x y+3 y^{2}\right) \times\left(6 x^{2}+5 y^{2}\right) \) (iii) \( \left(4 x^{2}+\frac{3}{2} y^{2}\right) \times\left(5 y-6 x^{2}\right) \) Find the following products: (i) \( 3 x^{2} \times(4 x+8) \times(4 x-1) \) (ii) \( (3 x+5) \times 6 x \times(-2 x+3) \) Find the following products: (i) \( (3 x+y) \times(3 x+4 y-8) \) (ii) \( \left(x^{2}+y^{2}+z^{2}\right)\left(z^{2}-y^{2}\right) \)

Solve for \( u \). \[ \sqrt{-51+67 u}=\sqrt{16 u} \]

La differenza delle dimensioni di un rettangolo misura 12 cm e la base è \( \frac{7}{6} \) dell'altezza. Calcola l'area di un quadrato isoperimetrico al rettangolo. Le dimensioni di un rettangolo sono congruenti ai lati di due quadrati aventi l'area di 600,25 \( \mathrm{~cm}^{2} \) e \( 1056,25 \mathrm{~cm}^{2} \). Calcola il perimetro e l'area del rettangolo.

Find all solutions to the equation. \[ \cos 2 x+\sqrt{2} \cos x=-1 \] Write your answer in radians in terms of \( \pi \), and use the "of Example: \( x=\frac{\pi}{5}+2 k \pi, k \in \mathbb{Z} \) or \( x=\frac{\pi}{7}+k \pi, k \in \mathbb{Z} \) \( x=\square \)

Solve the inequality. \( \qquad 14)(x+2)(x-7) \leq 0 \)