a) Looking at the bar graph, the lengths are represented in thousands of miles. Each vertical line on the graph represents 0.5 thousand miles. Looking at the bar representing mississippi, it is close to 2.5. The length of the Mississippi River iss approximately 2.35 thousand miles. Multiplying by 1000, it is 2350 miles
b) Rivers St Lawrence and Rio grand have equal bars. This means that they have equal length. The length is close to 2. It is approximately 1.9. By multiplying by 1000, the lengths are approximately 1900 miles