What type of motion is occurring when the slope of a velocity vs. time graph is changed?

The slope of a "velocity" graph is the magnitude of acceleration.

If the velocity is constant, acceleration is zero, and the graph is level.

If the slope of a velocity graph is changing, then the magnitude of acceleration is changing.

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