Which condition is necessary for a standing wave?

Standing waves can occur in either stationary or moving mediums.In stationary mediums, a standing wave generally occurs as a result of interference between two waves moving in opposite directions, as between a fundemental and its reflection in the closed volume of a resonating chamber such as an organ pipe.

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

in order to follow the instructions and complete the statements, i need to use data from table c of your student guide. can you think of a way to let me see your student guide for a while ? i can't answer the question without the data in table c.