Solve the problem.
-An auditorium has 30 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so forth. How many seats are in the auditorium?
A) 735 seats
B) 600 seats
C) 1170 seats
D) 1230 seats

Question

Quizplus · Accepted Answer

The number of seats in each row forms an arithmetic sequence with the first term a1 = 10 and a common difference d = 2. The nth term is given by an = a1 + (n-1)d. The total number of seats is the sum of the first 30 terms of this sequence: S30 = 30/2 * (2*10 + (30-1)*2) = 1170.

Solve the Problem. -An Auditorium Has 30 Rows with 10 Seats in the Seats