Digital ACT Math Practice Question #2059
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
S_15 = 15/2 * (a_1 + a_15) = 660.
Sum formula S_n = (n/2)[2a_1 + (n - 1)d] = (15/2)[2(2) + (15-1)(6)] = 660....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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