Mathematics
lekhabodepudi
31

if there are 2040 seats in a section of a stadium, 20 seats in the first row, and 4 more seats in each row, how many rows are there?

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(2) Answers
TorieBeiler687

2040 = n/2(20+(n-1)4)4080 = n(20+4n-4)4080= 20n +4n^2 -4n1020 = 4n + n^2n^2 +4n -1020 =0use common formula (can't write out so just look at answers. sorry)which gives answers of n=-34 and n=30. since n can only be positive, n=30 so there are 30 rows. I liked that challenge

candyisgoodfory

Nth term: 16+4n 2040=16+4n Subtract 16 from both sides 2024=4n Divide by 4 506=n 506 rows

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