- #1

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(a) Find the percentage of carbon dioxide in the room as a function of time.

attempt :

dy/dx = rate in - rate out

rate in = 0.05 * 3

rate out = 3 * y/180

from that my answer turned out to be :

y(t) = - (e^ (-t/60) * e ^(ln(9) + 1/300 ) - 9 )

any help?