Esmerelda and Brittany are at the library working on their algebra homework. Esmerelda is 7/9 done with her homework, and Britta
ny is 31/36 done with the same work. They want to compare these fractions to know who is closer to being done, but they know they cannot compare the fractions until they have the same denominator. What are these two fractions rewritten with a common denominator?