A chemist weighed three separate test samples at 0.17 gram, 0.204 gram, and 2.3 grams. What is the total weight of the three samples?

(1. Halla la suma de las cifras que reemplazan a los asteriscos ( \( ) \). \[ \begin{array}{l}4 x 7 \\ x * 3 \\ x * * \\ x * *\end{array} \]

f. \( (-26 a+10 b)(-3 a-5 b)= \) g. \( \left(\frac{3}{5} X^{3} y+\frac{6}{9} x^{2} y^{3}-\frac{1}{11} X Y^{4} Z\right)\left(-\frac{2}{3} x^{2} y\right)= \) h. \( \left(-15 x^{m+3} y^{2}\right)\left(-3 x^{m+2}+2 x^{m} y-5 x y^{2}\right)= \) 1. \( \left(-2 n^{3}+14 n\right)\left(-8 n^{3}-3+6 n\right)= \) j. \( \left(7 b^{3}-12 b-9\right)\left(-6 b^{2}+8 b-3\right)= \)

4) \( 2^{4}+(27-6): 3-\sqrt{25} \cdot 3 \)

ACTIVIDAD Resolver las siguientes ecuaciones utilizando la formula general. a) \( x^{2}-x-6=0 \) b) \( 2 x^{2}-4 x-6=0 \)

ind the perimeter of the polygon with the vertices \( G(2,4), H(2,-3), J(-2,-3) \), and \( K(-2,4) \)