(A)=2(75) Look (only) at graph in GC. Doe it increase or decrease? Find quantity Q when t=5. 3 Find time t when G=0.5 • Substitute Q=0.5 isolate exponential • take In both sides. • use log property isolate t calculate • • -round to nearest hundredth Find the half-life. [Time for Q to reduce to half.] Round to nearest hundredth. *You've done this for doubling! It's comparable work for half. *

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