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OpenStudy (anonymous):
Architecture: In a 20-row theater, the number of seas in a row increase by three with each successive row. The first row has 18 seats: a. Write an arithmetic series to represent the number of seats in the theater. b. Find the total seating capacity of the theater c. Front row tickets for a concert cost $60. After every 5 rows, the ticket price goes down by $5. What is the total amount of One generated by a full house?! I have A it is 18+21+24....+75 But I need help b and c
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OpenStudy (mertsj):
Use the formula for the sum of a arithmetic sequence
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