Calculus

Good afternoon. How would a formula be made for this question? I believe it is arithmetic.

How many rows are in the corner section of a sports complex if the first row has 18 seats and the last row has 51 seats and each successice row has one additional seat?

  1. 👍 0
  2. 👎 0
  3. 👁 49
  1. r = 51 - 18

    1. 👍 0
    2. 👎 0
  2. AS, with a = 18, d = 1, n = ? and term(n) = 51
    a+(n-1)d = term(n)
    18 + n-1 = 51
    n = 51+1-18 = 34

    34 rows

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