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a grocery store display consists of cases of soda. there are 15 cases at the base, and 1 case at the top. if there are 15 rows, how many cases are needed for the entire display? a) 180 b)30 c)130 d)15

  • trig -

    looks like an arithmetic series

    sum of terms of AS = (n/2)(first + last)
    = (15/2)(15+1) = 120

    1+2+3+4+5+6+7+8+9+10+11+12+13+14+15 = 120

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