\( \sum _ { k = 1 } ^ { 1 } ( \frac { 7 } { 4 } j ^ { 4 } - \frac { 3 } { 8 } j ^ { 2 } + 81 \)

Compare \( \frac{3}{11} \) and \( \frac{3}{12} \) by converting each fraction to a decimal. Which is larger? A. \( \frac{3}{12} \) (or 0.312 ) is the larger number. B. \( \frac{3}{12}( \) or 0.25 ) is the larger number. C. \( \frac{3}{11}( \) or 0.27 ) is the larger number. D. \( \frac{3}{11}( \) or 0.2727 ...) is the larger number.

Find the prime factorization of 50.

6. Calculá mentalmente qué número debe colocarse en cada caso para completar los siguientes cálculos. \( \begin{array}{llll}\text { a. } \frac{1}{3}+5=2 & \text { c. } \frac{3}{5}+\ldots=2 & \text { e. } \frac{5}{2}-\ldots .=1 & \text { g. } \frac{7}{5}-\frac{1}{2}=1 \\ \text { b. } \frac{1}{2}+\ldots=3 & \text { d. } \frac{7}{5}+\ldots \ldots . .=2 & \text { f. } \frac{7}{3}-\ldots \ldots=2 & \text { h. } \frac{11}{3}-\quad=2\end{array} \)

b. A triangle in quadrant II, reflected across the \( x \)-axis

9) Un cuadrado que tenga como area \( 16 \mathrm{~cm}^{2} \)