San carlos is 52 mi north of cross creek. cottonwood is 75 mi west of cross creek. how far apart are san carlos and cottonwood? round your answer to the nearest mile. a. 33 mi b. 91 mi c. 106 mi d. 127 mi

The Pythagorean theorem tells you the distance between the locations is
  √(52² +75²) ≈ 91.23 mi

The appropriate choice is
  B. 91 mi


An approximation that can get you within 6% of the correct value is this: add 1/3 of the short side of the right triangle to the long side. Here, that is
  75 + 52/3 = 92.3
This is close enough to the correct value to let you choose the correct answer.