Mathematics, 24.12.2019 02:31, kaziyahf2006

In a lecture hall at a collage, the number of seats per row increased at a constand rate. the professor counts 21 seats in row 3 and 33 seats in row 7. how many sets are there in row 18?

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In a lecture hall at a collage, the number of seats per row increased at a constand rate. the profes...