Um som num determinado local tem uma velocidade de 340 m/s. um altifalante ao vibrar a membrana nesse local emite 1250 pulsos por segundo. Determina a sua frequência de vibração da membrana do altifalante

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles