ALGEBRA 2 HELP PLEASE WILL FAN AND MEDAL.
In a 20-row theatre, the number of seats in a row increases by three with each successive row. The first row has 18 seats.
a. write an arithmetic series to represent the number of seats in a theatre
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 money generated by a full house?
(show work please)

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