Digital ACT Math Practice Question #1267
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Divide by 2 repeatedly: $800 \rightarrow 400 \rightarrow 200 \rightarrow 100 \rightarrow 50$. Takes under 10 seconds.
Calculate the number of half-lives elapsed: $n = \frac{\text{Total Time}}{\text{Half-life}} = \frac{60}{15} = 4$. The remaining activity is given by $A = A_0 \left(\frac{1}{2}\right)^n = 800 \left(\frac{1}{2}\right)^{4} = \frac{800}{16} = 5...
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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