Carmen walked 30 yards due north and 12 yards west, but then she went directly back to her staring point, as shown by the dotted line. How far ( to the nearest yard) did Carmen travel to get back to where she started?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.