posted by Julia .
Previos: D(t)=1550+42t-15t=1550=27t (t represtentnig time)
Based on the function for D, what would be the total amount of non functional components in 2014? Let 1993 be represented by 0.
assuming t is in years, in 2014, t = 21
Just plug in t=21 into your formula (which I can't seem to make understandable).