Finding chemical formulae from a mole ratio An unknown compound has the following chemical formula: where \( x \) stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 5.4 mol of nitrogen and 10.84 mol of oxygen. Write the complete chemical formula for the unknown compound.

Simplifica la siguiente expresión racional y exprésala en forma desarrollada. \( \frac{81 y^{2}-169}{9 y^{2}-22 y+13}= \) Cuáles valores reales de \( y \) hacen que la expresión to esté definida? A todas las respuestas adecuadas: \( y=2 \) B \( y=1 \) C \( y=\frac{13}{9} \) D \( y=-\frac{9}{13} \) D

A car accelerates at a rate of \( 8.8 \mathrm{~m} / \mathrm{s}^{2} \) with a force from the tires of 19,976 What is the mass of the car?

[9] Find the matrix associated with the following lineor maps. (a) \( F: R^{2} \rightarrow \mathbb{R}^{2} \) given by \( F(x, y)=(3 n, 3 y) \)

1. Notasi faktorial: a. \( n!=n \cdot(n-1) \cdot(n-2) \cdot \ldots \cdot 3 \cdot 2 \cdot 1 \), untuk \( n \) bilangan bulat positif, b. \( 0!=1 \)

18. LESsICO In conclusione Fedro ricorda che "La favola e per quelli / che con pretesti gli innocenti opprimono" (vv. 17-18). Analizza il termine pretesto, indicandone l'etimologia e le diverse accezioni, quindi proponi almeno due sinonimi, uno per ciascun valore.