Respuesta :
Sarah: School to mall = 21
      mall to library = 20
Total distance for Sarah = 20 + 21 = 41 miles.
Use the Pythagorean theorem to find the distance Bret traveled:
Distance = SQRT(21^2 + 20^2)
       = sqrt(441 + 400)
       = sqrt(841)
       = 29 miles
Total distance  = 41 + 29 = 70 miles
Answer is D. 70 miles.
