1548 A tank can be filled in 9 hours by one pipe, 12 hours by a second pipe and can be drained when full by a third pipe in 15 hours. How long will it take to fill an emply tank with all pipes in operation?

7) Realizar las siguientes divisiones, y expresar el resultado en notación cientifica: a) \( \frac{6 \times 10^{5}}{3 \times 10^{2}} \) b) \( \frac{8 \times 10^{-7}}{2 \times 10^{-9}} \) c) \( \frac{3 \times 10^{6}}{6 \times 10^{15}} \) d) \( \frac{3.5 \times 10^{15}}{7 \times 10^{20}} \) e) \( \frac{\left(2,49 \times 10^{3}\right)\left(2 \times 10^{-18}\right)}{5 \times 10^{-10}} \) f) \( \frac{6,3506 \times 10^{-5}}{5,62 \times 10^{-12}} \)

Walter pays \( \$ 2.53 \) to ship a package that weighs 5.5 ounces. Which is the cost to ship 1 ounce? A) \( \$ 4.60 \) B) \( \$ 0.43 \) C) \( \$ 4.60 \) D) \( \$ 0.46 \)

2. A recycling plant processes an average of \( \frac{1}{3} \) ton of glass each minute. At approximately what rate does the recycling plant process glass, in tons per day? ( 1 day \( =24 \) hours) A. 20 B. 180 C. 480 D. 4,320

6 Durante el verano se recolectaron 95 toneladas de residuos sólidos en las costas de Lima. 8 toneladas fue- ron deshechos orgánicos y el resto se debe distribuir en 7 centros de reci- claje en un número exacto de tonela- das. Analiza la información y calcula cuántas toneladas quedan luego de la distribución.

Maria bought g gallons of gasoline for \( \$ 3.55 \) per gallon and c cans of oil for \( \$ 4.15 \) per can. a. What expression can be used to determine the total amount Maria spent on gasoline and oil? b. If she bought 6.4 gallons of gasoline and 7 cans of oil, how much did she spend in all? A. \( 3.55 \mathrm{~g} \cdot 4.15 \mathrm{c} \) B. \( 3.55 \mathrm{c}+4.15 \mathrm{~g} \) C. \( 3.55 \mathrm{~g}+4.15 \mathrm{c} \) b. \( 3.55 \mathrm{c} \cdot 4.15 \mathrm{~g} \) Maria spent \( \$ \square \) in all. (Round to the nearest cent as needed.)