There are 15 rows of seats in an auditorium. the first row has 20 seats, and each of the other rows has 5 more seats than the row in front. which of the following is formed by the number of seats in each row?
a. an arithmetic series
b. an arithmetic sequence
c. a geometric series
d. a geometric sequence

Option B. An arithmetic sequence

Step-by-step explanation:

There are 15 rows of seats in an auditorium. The first row has 20 seats, and each row has 5 more seats than the row in front.

This means sequence formed for seats will be

20, (20+5), (20+5+5), (20+5+5+5)20 rows

Or 20, 25, 30, 35, 40,20 rows

Since every term of this sequence is 5 more than its previous term.

Means there is a common difference of 25 - 20 = 5

Therefore, the sequence formed is an arithmetic sequence.

Please note it's a sequence because it has finite terms. If the sequence has infinite terms then this sequence will be called as series.

Option B. Arithmetic sequence is the answer.

what is the graph

step-by-step explanation: