Digital ACT Math Practice Question #1266
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Divide by 2 repeatedly: $960 \rightarrow 480 \rightarrow 240 \rightarrow 120 \rightarrow 60 \rightarrow 30$. Takes under 10 seconds.
Calculate the number of half-lives elapsed: $n = \frac{\text{Total Time}}{\text{Half-life}} = \frac{70}{14} = 5$. The remaining activity is given by $A = A_0 \left(\frac{1}{2}\right)^n = 960 \left(\frac{1}{2}\right)^{5} = \frac{960}{32} = 3...
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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