15 only has 4 factors 1,3,5, and 15 so you can draw a rectangle that has dimensions 15 by 1 or 3 by 5. 36 has lots of factors: 1 and 36, 2 and 18, 3 and 12, 6 and 6, so you could draw a rectangle for each one of those factor pairs.
It will take 5 full rotations for Elena's car to travel ten yards
explanation: 10 yards=30 feet, and there are 12 inches in one foot. multiply 30 by 12. once you do that, you get 360. next, divide 360 by the 72 inches in each full rotation. 360/72=5. so the answer is 5 full rotations
