Während einer Unterrichtsstunde steigt die Temperatur im Klassenzimmer von \( 18^{\circ} \mathrm{C} \) auf \( 21^{\circ} \mathrm{C} \). Die Abmessungen des Raums seien \( 12 \mathrm{~m} \times 5 \mathrm{~m} \times 4 \mathrm{~m} \). Wie viel Lut entweicht aus dem Zimmer? \( \gamma_{\text {Lut }}=3,67 \cdot 10^{-3} 1 /^{\circ} \mathrm{C} \) age 2

Write a sentence to explain how Jacob could use estimate to tell that his answer is incorrect.

\( f(x)=\sqrt{ } x \) en \( a=3 \)

05) Simplifique as frações algébricas: (a) \( \left(16 x^{2}\right):\left(-4 x^{2}\right) \) (b) \( \left(36 x y^{2}\right):(-6 x y) \) (c) \( (-35 a):(+7 a) \) (d) \( \left(+3 a b^{2}\right):\left(-\frac{10}{5}\right) \) (e) \( \left(-\frac{4}{5} x^{2} y\right):\left(+\frac{4}{3} x^{2} y\right) \)

Find the product of the following two matrices. \[ \left[\begin{array}{cc}-2 & 2 \\ 1 & 1\end{array}\right]\left[\begin{array}{cc}-2 & 4 \\ -1 & 1\end{array}\right] \]

In un rettangolo il perimetro è di 40 cm e l'al terra èil triplo della base. Calcola la lunghezz detle due dimensioni. \( \quad \) [ 5 cm ; 15 cm