Mathematics, 27.03.2021 04:10 Serenitybella

4. A concert hall has its seats arranged so that each row has thirty more seats than the row in front of it. a) If the hall has 20 rows and the third row has 120 seats how many seats are in the last row?

b) How many seats are there altogether?

Please help me. I can't figure out how to solve this properly.

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4. A concert hall has its seats arranged so that each row has thirty more seats than the row in fron...