Question 1140422
{{{cross(m(t)=280e^-0.015t)}}}

{{{m(t)=280e^(-0.015t)}}}

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(a) Find the mass at time t=0
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280, found by inspection and understanding the equation



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(b) How much of the mass remains after 35 years? 
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{{{m(35)=280*e^(-0.015*35)}}}
{{{evaluate}}}.