Digital ACT Math Practice Question #1440
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
S_20 = 10 * (3 + 79) = 820.
A_1 = 4(1) - 1 = 3. a_20 = 4(20) - 1 = 79. S_20 = 20 * (a_1 + a_20) / 2 = 10 * (3 + 79) = 10 * 82 = 820....
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