Explain the difference between a fixed pulley, movable pulley, and a pulley system

the assestment will probley apele with cause and effect

a.   mass number from atomic number

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