Achild built a toy rail road 5 meters long. he also bought two trains which run on batteries. unfortunately he ran out of batteries and had to get batteries from other toys. after the batteries' installation the first train could run 30cm/s and the second train only 10cm/s. he made the trains run toward each other. in how many seconds the trains will meet

Se tiene en una caja de canicas 10, 4 blancas y 6 negras ¿cual es la probabilidad que en 2 extracciones con reemplazo sean blancas? ¿cual es la probalidad que en 2 extracciones sin reemplazo sean negras?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?

Line wx is parallel to line yz. if m