Question

The seats at a local baseball stadium are arranged so that each row has five more seats than the row below it. If there are four seats in the first row, how many seats are in row 23?

119

114

115

110

Is the answer 114? The seats at a local baseball stadium are arranged so that each row has five more seats than the row below it. If there are four seats in the first row, how many seats are in row 23?
119

114

115

110

Answer 1

Answer: 114

Explanation:

Use the Explicit formula for Arithmetic Sequences:

aₙ = a₁ + (n-1)d

a₂₃ = 4 + (23-1)5

a₂₃ = 4 + (22)5

a₂₃ = 4 + 110

a₂₃ = 114

I also did the exam.

Answer 2

In this problem you can use the equation 5x-1. You simply plug in for x, which in this case is 23, and solve. 5(23)-1 = 115 -1
=114
Your answer is 114.