SAT Math Practice Question #2321 (Medium) | Test Citadel
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SAT Math Difficulty: Medium

Digital SAT Math Practice Question #2321

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A radioactive sample has mass $m(t) = 500(0.8)^t$. After how many years will it be reduced to 256 grams?
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Masterclass Solution & Distractor Trap Analysis

$256 = 500(0.8)^t \implies (0.8)^t = 256/500 = 0.512$. Since $0.8^3 = 0.512$, $t = 3$....

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

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