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Caroline
Caroline asked in Science & MathematicsMathematics · 4 months ago

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?

3 Answers

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  • ?
    Lv 7
    4 months ago
    Favorite Answer

    60, 68, 76, 84, ...

    a_n = 4 (2 n + 13) 

    a20 = 212 

    There are 212 seats in the 20th row,

  • Wayne DeguMan
    Lv 7
    4 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

    :)>

  • ted s
    Lv 7
    4 months ago

    the function is 52 + 8 x , where x = row number

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