Can some explain to be on what to do with a question like this:
Suppose a movie theater has 42 rows of seats and there are 29 seats in the first row. Each row after the first has 2 more seats than the row before it. How many seats are in the theater?

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I know it's using gemoetric or arithmetic stuff

ok. so can u tell me how many seats in the second row?

31 right?

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