ACT Math Practice Question #2060 (Hard (570)) | Test Citadel
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ACT Math Difficulty: Hard (570)

Digital ACT Math Practice Question #2060

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What is the sum of the first 25 terms of an arithmetic sequence with initial term a_1 = 10 and common difference d = 5?
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S_25 = 25/2 * (a_1 + a_25) = 1750.

Masterclass Solution & Distractor Trap Analysis

Sum formula S_n = (n/2)[2a_1 + (n - 1)d] = (25/2)[2(10) + (25-1)(5)] = 1750....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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