A(t)=160e^-.70t. when t = 4.

Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t)=160e^-.70t.  Find the rate of decay of the quantity present at the time when t=4.
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1 Answer

y=160e^-0.7t & evaluate at t=4

0.7t=0.7*4=2.8

e^-2.8=0.0608100626252179822525336027503...

160*e^-2.8=9.72961002003487716040537684400...
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