## College Algebra 7th Edition

$D(20)\approx 1.6$ ft
We are given: $D(t)=\frac{5.4}{1+2.9e^{-0.01t}}$ We plug in $t=20$ years: $D(20)=\frac{5.4}{1+2.9e^{-0.01*20}}\approx 1.6$ ft