Hi, 

Re:  Annual Income = I(t) = -0.1t^2+2t where t is time in years

I(t) = -.1t(t - 20)

I(0) = 0 & I(20) = O



I(t) = -0.1t^2+2t  (note: negative coefficient of the squared term)

graph of this parabola opens downward, with a maximum at 10years (0+20)/2 

After 10 years, the income begins to decline. 



 

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