1 Choose: Joseph 2 Choose: subtract 3 Choose: intervals 4 Choose: dots
Joseph is correct because he is calculating the difference between the longest and shortest lengths, which involves subtracting the shortest length from the longest length. The difference is determined by the intervals represented by the dots, and if that difference is indeed 2 1/2 feet, then Joseph's conclusion is accurate. Marta's assertion that there is no difference indicates a misunderstanding of how to measure the difference between the greatest and least lengths.