(08.01)
the seats at a local baseball stadium are arranged so that each row has 5 more seats than the row below it. if there are 4 seats in the 1st row, how many seats are in row 23? (2 points)

110
114
115
119
score: 2 of 2

The given in the problem above is an arithmetic sequence with the first term equal to 4 and the common difference is 5. To determine the number of seats on row 23, use the formula,
 
                                         an = a1 + (n - 1) d

Solving for the 23rd term, 
 
                                          an  = 4 + (22) 5 = 114 seats

Therefore, the answer is there are 114 seats on the 23rd row.