La frecuencia del silbato de una locomotora de tren es de 348 Hz. El tren viaja con una velocidad de 35m/s. ¿Qué frecuencia percibe un observador en reposo cuando el tren se acerca? ¿Qué frecuencia percibe cuando se aleja?

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points