I want to know the answer to the following question:
How many round-trippers did Rodriguez slug in his first season in Chicago?
All the background I'm provided with is that "After the retirement of Sandberg and the trade of Dunston, the Cubs had holes to fill and the signing of Henry Rodríguez, known affectionately as "H-Rod" to bat cleanup provided protection for Sammy Sosa in the lineup, as Rodriguez slugged 31 round-trippers in his first season in Chicago.". Is that enough to answer the question?