Question

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

Answer 1

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. 
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