Suppose that ππ΄ ππ‘ = β0.0004332 π΄(π‘) represents a mathematical model for the radioactive decay of radium β 226, where π΄(π‘) is the amount of radium (measured in grams) remaining at time π‘ (measured in years). How much of the radium sample remains at the time π‘ = β0.002 with initial condition π΄(1) = 0.005
"dA\/dt =-0.0004332"
"\\int dA=\\smallint -0.0004332 dt"
A(t)=-0.0004332t +C
A(1)=0.005=-0.0004332x1+C
C=0.0054332
A(-0.002)=-0.0004332x(-0.002)+0.0054332=0.005434
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