3.-Resuelve las siguientes operaciones combinadas: \( \begin{array}{l}\text { a) }(-5)^{2}[3+28:(-4)] \\ \text { b) }(-13) .(+3)-(-12) \cdot(+7) \\ \text { c) }(-4)^{3}:[(-15): 5-(-45):(-9)]\end{array} \)

Teniendo en cuenta la tabla, realiza las siguientes conversiones con su procedimiento completo: 1. 62 km a m. \( \begin{array}{llllll}\text { a) } 6,2 & \text { b) } 6200 & \text { c) } 62000 & \text { d) } 0,62 & \text { e) } 620\end{array} \)

Using the following conversions between the metric and U.S. systems, convert the measurement. Round your answer to 3 decimal places as needed There are 8 ounces in a cup, 2 cups in a pint, 2 pints in a quart, and 4 quarts in a gallon. \( 1 \mathrm{~L}=0.26 \) gallons \( 26.04 \mathrm{~mL}= \)

a. \( 59.95 m-30+7.95 m+45+9.49 m \)

7 km a dm \( \begin{array}{lllll}\text { a) } 70 & \text { b) } 70000 & \text { c) } 0,7 & \text { d) } 0,07 & \text { e) } 7000\end{array} \)

\( \frac{1}{3} \) part of total students in a classroom boys. If there are 32 girls in the classrom how many students are there in the cla room?