Why is using a slinky not a perfect model for how seismic waves travel through earth?

because the earth is more consistent and while you use a slinky your hand moving it is not very controlled

resonant frequency

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