Anna went from home to school with the speed 3 km/hour. she ran back home with the speed 6 km/hour. her sister olga went to school and back with the same speed, and she spent as much time on the road as anna. what was olga's speed?

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

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?

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?