(c) KNO \( { }_{3} \) dissolves in nethanof; this mass \( x \) grams dissulved at \( t \) seconds satisfies the differential equation \[ \frac{d y}{d t}=-0,004 y^{2}+0,8 y \] (i) What is the max amount of satt that will ever dissolve? (ii) If \( y(0)=50 \mathrm{~g} \), how long will it toke an additional sog to dissolve? lii) Draw a phase line using the equilibrium points and state if they ane Stable or unstable.

Un triangolo rettangolo ha i cateti lunghi rispetti- vamente 60 cm e 32 cm . Calcola ''area di un trian- golo simile sapendo che la sua ipotenusa misura 51 cm .

7. Hallen el valor del tercero proporcional. \( \begin{array}{ll}\text { a. } \frac{6,4}{8}=\frac{8}{\square} & \text { c. } \frac{1,4}{\frac{1}{3}}=\frac{\frac{2}{3}}{\underbrace{3}} \\ \text { b. } \frac{0,9}{0,3}=\frac{0,3}{\square} & \text { d. } \frac{81}{4,5}=\frac{4,5}{\square}\end{array} \)

The question below is appropriate for which grade/s? Convert 9 litres to kilolitres Grade 5 Grade 6 Grade 4 Grade \( 4 ; 5 \) and 6

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What does the sign of the middle term in the trinomial \( x^{2}-x-12 \) tell you? A. The numbers \( m \) and \( n \) will be opposites. B. The larger of the absolute values of \( m \) and \( n \) will have a negative sign. C. The product of \( m \) and \( n \) will be -1 . D. The larger of the absolute values of \( m \) and \( n \) will have a positive sign.