# Math hw help please!!?

A theater has 60 seats in the first row, 68 in the second row, 76 in the third row, and so on. If the theater has 20 rows of seats, how many seats are in the 20th row?

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- ?Lv 72 months agoFavourite answer
60, 68, 76, 84, ...

a_n = 4 (2 n + 13)

a20 = 212

There are 212 seats in the 20th row,

- ?Lv 72 months ago
Here we have the sequence: 60, 68, 76,...

i.e. arithmetic sequence with 1st term 60 and common difference 8

so, nth term is 8n + 52....where n is the row number

Hence, in row 20 we have 8(20) + 52 => 212 seats

:)>

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