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What is the size of the matrix resulting from

Adriver from the university of florida women’s swimming and diving team is competing in the in ncaa zone b championships

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?