Dos conducores que viajan en tractomulas se en encuentran en la via que conduce de Bogota a cartagena. Los dos van en direcciones opuestas; el que viaja de bogota a cartagena viaja a 90 km/h y el que viaja de cartagena a bogota lo hace a 50km/h y se encuentran en una recta a 200 m uno del otro. Si en ese instante tocan la bocina simultaneamente con una frecuencia de 900 hz .¿cual es la frecuencia que percibe cada conductor cuando escucha la bocina de la otra tractomula?

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.