If Ann is at 0, Ben will be four units away from her which could be 4 or -4 so since Carl will be 2 units away from Ben, he the only possible locations are 6, or -6
Well if it is 1 inch per 100 feet, then we already know that 600 feet is 6 inches on the map. Now the 4 is where it gets trickier. Since it's dividing it by 100 each time, you take 4 and divide it by 100 which is 0.04. Therefore, your answer is 6.04 inches on the map.
