Find the sum of the first 90 terms of the sequence –4, –1, 2, 5, 8, ...

The sequence is arithmetic: it starts at −4 and increases by 3 each term. The 90th term is −4 + 89(3) = 263, so the sum is 90(−4 + 263)/2 = 45 × 259 = 11,655. The correct choice is 11,655.

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