Question

A concert hall has 25 rows of seats. There are 22 seats on the first row, 24 seats on the second row, 26 seats on the third row, and so on. How many seats are in the hall?

Answer 1

Answer:

This concert is for a band or what tell

Answer 2

Answer:

1150 seats

Step-by-step explanation:

Sn= n/2 [2a+(n-1)d]

In this question the n is 25

a is 22 and d is 2

so;

Sn= 25/2 [2(22)+(25-1)2]

    12.5[44+(24)2]

     12.5 [44+48]

       12.5(92)

  =1150