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What causes the graph of \( y=x^{2} \) to open downward?

2. Wiements in the came group of the periodic table 7 have A similar electronic contiguration. 8 similar cubital configuration. C the same number of valence electrons. in the same number of electrons.

Responde dos preguntas sobre la siguiente expresión racional. \( \frac{x^{2}+12 x+36}{x^{2}-36} \) 1. ¿Cuál es una expresión equivalente en su nínima expresión? 2. ¿Qué valores de \( x \) debemos excluir de los dominios de las expresiones?

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 chlorine and 2.74 mol of platinum. Write the complete chemical formula for the unknown compound.

b) \( -4 \frac{1}{3} \div \frac{2}{5} \)