Math Test—No Calculator - The SAT Suite of Assessments

Seven days = 7 half-lives; (1/2)7.0294 = 0.0076549 remaining = 0.0765 g #9: 5.00 / 100.0 = 0.05 (decimal fraction remaining) (1/2)n = 0.05. n log 0.5 = log 0.05. n = 4.32 half-lives. 36.0 hours x 4.32 = 155.6 hours #10. If you lose 75%, then 25% remains. Use 0.25 rather than 25%. (1/2)n = 0.25. n = 2 (remember (1/2)2 = 1/4 and 1/4 = 0.25) ................
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